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Document and Entity Information	12 Months Ended
Document and Entity Information	Dec. 31, 2018 shares
Entity Registrant Name	NIO Inc.
Entity Central Index Key	0001736541
Trading Symbol	nio
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Document Type	20-F
Document Period End Date	Dec. 31, 2018
Amendment Flag	false
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Entity Shell Company	false
Entity Ex Transition Period	true
Entity Emerging Growth Company	true
Class A Ordinary Shares
Entity Common Stock, Shares Outstanding	770,268,810
Class B Ordinary Shares
Entity Common Stock, Shares Outstanding	132,030,222
Class C Ordinary Shares
Entity Common Stock, Shares Outstanding	148,500,000

CONSOLIDATED BALANCE SHEETS ¥ in Thousands, $ in Thousands	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)
Current assets:
Cash and cash equivalents	¥ 3,133,847	$ 455,799	¥ 7,505,954
Restricted cash	57,012	8,292	10,606
Short-term investment	5,154,703	749,720
Trade receivable	756,508	110,030
Amounts due from related parties	88,066	12,809	29,556
Inventory	1,465,239	213,110	89,464
Prepayments and other current assets	1,514,257	220,240	674,425
Total current assets	12,169,632	1,770,000	8,310,005
Non-current assets:
Long-term restricted cash	33,528	4,876	14,293
Property, plant and equipment, net	4,853,157	705,862	1,911,013
Intangible assets, net	3,470	505	4,457
Land use rights, net	213,662	31,076	0
Long-term investments	148,303	21,570	47,125
Amounts due from related parties	7,970	1,159	50,000
Other non-current assets	1,412,830	205,488	131,141
Total non-current assets	6,672,920	970,536	2,158,029
Total assets	18,842,552	2,740,536	10,468,034
Current liabilities:
Short-term borrowings	1,870,000	271,980	28,787
Trade payable	2,869,953	417,417	234,011
Amounts due to related parties	219,583	31,937	40,069
Taxes payable	51,317	7,464	30,055
Current portion of long-term borrowings	198,852	28,922
Accruals and other liabilities	3,383,681	492,136	1,285,592
Total current liabilities	8,593,386	1,249,856	1,618,514
Non-current liabilities:
Long-term borrowings	1,168,012	169,880	642,401
Other non-current liabilities	930,812	135,382	141,113
Total non-current liabilities	2,098,824	305,262	783,514
Total liabilities	10,692,210	1,555,118	2,402,028
Commitments and contingencies (Note 28)
MEZZANINE EQUITY
Redeemable non-controlling interests	1,329,197	193,324
Total mezzanine equity	1,329,197	193,324	19,657,786
SHAREHOLDERS' (DEFICIT)/EQUITY
Ordinary shares			60
Treasury shares	(9,186)	(1,336)	(9,186)
Additional paid in capital	41,918,936	6,096,856	131,907
Accumulated other comprehensive income/(loss)	(34,708)	(5,048)	(13,922)
Accumulated deficit	(35,039,810)	(5,096,329)	(11,711,948)
Total NIO Inc. shareholders' (deficit)/equity	6,837,041	994,406	(11,603,089)
Non-controlling interests	(15,896)	(2,312)	11,309
Total shareholders' (deficit)/equity	6,821,145	992,094	(11,591,780)
Total liabilities, mezzanine equity and shareholders' equity	18,842,552	2,740,536	10,468,034
Series A-1 and A-2 convertible redeemable preferred shares
MEZZANINE EQUITY
Total mezzanine equity			5,011,731
Series A-3 convertible redeemable preferred shares
MEZZANINE EQUITY
Total mezzanine equity			427,129
Series B convertible redeemable preferred shares
MEZZANINE EQUITY
Total mezzanine equity			2,294,980
Series C convertible redeemable preferred shares
MEZZANINE EQUITY
Total mezzanine equity			4,454,596
Series D convertible redeemable preferred shares
MEZZANINE EQUITY
Receivable from a holder			(78,410)
Total mezzanine equity			¥ 7,547,760
Class A Ordinary Shares
SHAREHOLDERS' (DEFICIT)/EQUITY
Ordinary shares	1,329	193
Class B Ordinary Shares
SHAREHOLDERS' (DEFICIT)/EQUITY
Ordinary shares	226	33
Class C Ordinary Shares
SHAREHOLDERS' (DEFICIT)/EQUITY
Ordinary shares	¥ 254	$ 37

CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Mezzanine equity, shares issued		813,868,585
Ordinary shares, par value (in dollars per share)	$ 0.00025	$ 0.00025
Ordinary shares, shares authorized	1,219,469,778	1,151,269,325
Ordinary shares, shares issued		36,727,350
Ordinary shares, shares outstanding		23,850,343
Series A-1 and A-2 convertible redeemable preferred shares
Mezzanine equity, par value (in dollars per share)	$ 0.00025	$ 0.00025
Mezzanine equity, shares authorized		295,000,000
Mezzanine equity, shares issued		295,000,000
Mezzanine equity, shares outstanding		295,000,000
Series A-3 convertible redeemable preferred shares
Mezzanine equity, par value (in dollars per share)	$ 0.00025	$ 0.00025
Mezzanine equity, shares authorized		31,720,364
Mezzanine equity, shares issued		24,210,431
Mezzanine equity, shares outstanding		24,210,431
Series B convertible redeemable preferred shares
Mezzanine equity, par value (in dollars per share)	$ 0.00025	$ 0.00025
Mezzanine equity, shares authorized		114,867,321
Mezzanine equity, shares issued		114,867,321
Mezzanine equity, shares outstanding		114,867,321
Series C convertible redeemable preferred shares
Mezzanine equity, par value (in dollars per share)	$ 0.00025	$ 0.00025
Mezzanine equity, shares authorized		167,142,990
Mezzanine equity, shares issued		166,205,830
Mezzanine equity, shares outstanding		166,205,830
Series D convertible redeemable preferred shares
Mezzanine equity, par value (in dollars per share)	$ 0.00025	$ 0.00025
Mezzanine equity, shares authorized		240,000,000
Mezzanine equity, shares issued		213,585,003
Mezzanine equity, shares outstanding		213,585,003
Class A Ordinary Shares
Ordinary shares, par value (in dollars per share)	$ 0.00025	$ 0.00025
Ordinary shares, shares authorized	2,500,000,000
Ordinary shares, shares issued	777,200,790
Ordinary shares, shares outstanding	770,268,810
Class B Ordinary Shares
Ordinary shares, par value (in dollars per share)	$ 0.00025	$ 0.00025
Ordinary shares, shares authorized	132,030,222
Ordinary shares, shares issued	132,030,222
Ordinary shares, shares outstanding	132,030,222
Class C Ordinary Shares
Ordinary shares, par value (in dollars per share)	$ 0.00025	$ 0.00025
Ordinary shares, shares authorized	148,500,000
Ordinary shares, shares issued	148,500,000
Ordinary shares, shares outstanding	148,500,000

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 CNY (¥) ¥ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 CNY (¥) ¥ / shares shares	Dec. 31, 2016 CNY (¥) ¥ / shares shares
Revenues:
Vehicle sales and other sales revenue \| ¥	¥ 4,951,171		¥ 0	¥ 0
Total revenues	4,951,171	$ 720,117
Cost of sales:
Total cost of sales	(5,207,047)	(757,333)
Gross loss	(255,876)	(37,216)
Operating expenses:
Research and development	(3,997,942)	(581,477)	(2,602,889)	(1,465,353)
Selling, general and administrative	(5,341,790)	(776,931)	(2,350,707)	(1,137,187)
Total operating expenses	(9,339,732)	(1,358,408)	(4,953,596)	(2,602,540)
Loss from operations	(9,595,608)	(1,395,624)	(4,953,596)	(2,602,540)
Interest income	133,384	19,400	18,970	27,556
Interest expenses	(123,643)	(17,983)	(18,084)	(55)
Share of losses of equity investees	(9,722)	(1,414)	(5,375)
Investment income \| ¥			3,498	2,670
Other income/(loss), net	(21,346)	(3,105)	(58,681)	3,429
Loss before income tax expense	(9,616,935)	(1,398,726)	(5,013,268)	(2,568,940)
Income tax expense	(22,044)	(3,206)	(7,906)	(4,314)
Net loss	(9,638,979)	(1,401,932)	(5,021,174)	(2,573,254)
Accretion on convertible redeemable preferred shares to redemption value	(13,667,291)	(1,987,825)	(2,576,935)	(981,233)
Accretion on redeemable non-controlling interests to redemption value	(63,297)	(9,206)
Net loss attributable to non-controlling interests	41,705	6,066	36,440	36,938
Net loss attributable to ordinary shareholders of NIO Inc.	(23,327,862)	(3,392,897)	(7,561,669)	(3,517,549)
Net loss	(9,638,979)	(1,401,932)	(5,021,174)	(2,573,254)
Other comprehensive income/(loss)
Foreign currency translation adjustment, net of nil tax	(20,786)	(3,023)	(124,374)	55,493
Total other comprehensive income/(loss)	(20,786)	(3,023)	(124,374)	55,493
Total comprehensive loss	(9,659,765)	(1,404,955)	(5,145,548)	(2,517,761)
Accretion on convertible redeemable preferred shares to redemption value	(13,667,291)	(1,987,825)	(2,576,935)	(981,233)
Accretion on redeemable non-controlling interests to redemption value	(63,297)	(9,206)
Net loss attributable to non-controlling interests	41,705	6,066	36,440	36,938
Comprehensive loss attributable to ordinary shareholders of NIO Inc.	¥ (23,348,648)	$ (3,395,920)	¥ (7,686,043)	¥ (3,462,056)
Weighted average number of ordinary shares used in computing net loss per share
Basic and diluted (in shares) \| shares	332,153,211	332,153,211	21,801,525	16,697,527
Net loss per share attributable to ordinary shareholders
Basic and diluted \| (per share)	¥ (70.23)	$ (10.21)	¥ (346.84)	¥ (210.66)
Weighted average number of ADS used in computing net loss per ADS
Basic and diluted (in shares) \| shares	332,153,211	332,153,211
Net loss per ADS attributable to ordinary shareholders
Basic and diluted \| (per share)	¥ (70.23)	$ (10.21)
Vehicle sales
Revenues:
Vehicle sales and other sales revenue	¥ 4,852,470	$ 705,762	¥ 0
Cost of sales:
Vehicle sales and other sales cost of sales	(4,930,135)	(717,058)
Other sales
Revenues:
Vehicle sales and other sales revenue	98,701	14,355
Cost of sales:
Vehicle sales and other sales cost of sales	¥ (276,912)	$ (40,275)

CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ (DEFICIT)/EQUITY ¥ in Thousands, $ in Thousands	Series A-1 and A-2 convertible redeemable preferred shares Accumulated deficit CNY (¥)	Series A-1 and A-2 convertible redeemable preferred shares Total Shareholders' Deficit CNY (¥)	Series A-1 and A-2 convertible redeemable preferred shares CNY (¥)	Series A-3 convertible redeemable preferred shares Accumulated deficit CNY (¥)	Series A-3 convertible redeemable preferred shares Total Shareholders' Deficit CNY (¥)	Series A-3 convertible redeemable preferred shares CNY (¥)	Series B convertible redeemable preferred shares Accumulated deficit CNY (¥)	Series B convertible redeemable preferred shares Total Shareholders' Deficit CNY (¥)	Series B convertible redeemable preferred shares CNY (¥)	Series C convertible redeemable preferred shares Accumulated deficit CNY (¥)	Series C convertible redeemable preferred shares Total Shareholders' Deficit CNY (¥)	Series C convertible redeemable preferred shares CNY (¥)	Series D convertible redeemable preferred shares Accumulated deficit CNY (¥)	Series D convertible redeemable preferred shares Total Shareholders' Deficit CNY (¥)	Series D convertible redeemable preferred shares CNY (¥)	Ordinary Shares CNY (¥) shares	Treasury Shares CNY (¥) shares	Additional paid in capital CNY (¥)	Accumulated other comprehensive income/(loss) CNY (¥)	Accumulated deficit CNY (¥)	Total Shareholders' Deficit CNY (¥)	Non- Controlling Interests CNY (¥)	CNY (¥)	USD ($)
Balance at Dec. 31, 2015																¥ 47	¥ (9,186)	¥ 13,748	¥ 54,959	¥ (559,396)	¥ (499,828)		¥ (499,828)
Balance (in shares) at Dec. 31, 2015 \| shares																28,900,001	(18,400,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accretion on convertible redeemable preferred shares to redemption value	¥ (798,481)	¥ (798,481)	¥ (798,481)	¥ (29,983)	¥ (29,983)	¥ (29,983)	¥ (152,769)	¥ (152,769)	¥ (152,769)
Accretion on redeemable non-controlling interests to redemption value																							0
Vesting of restricted shares																		39,104			39,104		39,104
Vesting of restricted shares (in shares) \| shares																	7,273,458
Vesting of share options																		17,998			17,998		17,998
Grant of restricted shares																¥ 5					5		5
Grant of restricted shares (in shares) \| shares																3,103,809	(3,103,809)
Capital injection by non-controlling interests																						¥ 25,355	25,355
Foreign currency translation adjustment																			55,493		55,493		55,493
Net loss																				(2,536,316)	(2,536,316)	(36,938)	(2,573,254)
Balance at Dec. 31, 2016																¥ 52	¥ (9,186)	70,850	110,452	(4,076,945)	(3,904,777)	(11,583)	(3,916,360)
Balance (in shares) at Dec. 31, 2016 \| shares																32,003,810	(14,230,351)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accretion on convertible redeemable preferred shares to redemption value	(2,205,227)	(2,205,227)	(2,205,227)	(120,451)	(120,451)	(120,451)	(40,011)	(40,011)	(40,011)	¥ (56,283)	¥ (56,283)	¥ (56,283)	¥ (154,963)	¥ (154,963)	¥ (154,963)
Accretion on redeemable non-controlling interests to redemption value																							0
Exercise of share options																¥ 5		6,207			6,212		6,212
Exercise of share options (in shares) \| shares																2,723,540
Vesting of restricted shares																		24,723			24,723		24,723
Vesting of restricted shares (in shares) \| shares																	3,353,344
Vesting of share options																		30,127			30,127		30,127
Grant of restricted shares																¥ 3					3		3
Grant of restricted shares (in shares) \| shares																2,000,000	(2,000,000)
Capital injection by non-controlling interests																						13,376	13,376
Acquisition of additional interests in subsidiaries from non-controlling interests																				(73,334)	(73,334)	45,956	(27,378)
Foreign currency translation adjustment																			(124,374)		(124,374)		(124,374)
Net loss																				(4,984,734)	(4,984,734)	(36,440)	(5,021,174)
Balance at Dec. 31, 2017																¥ 60	¥ (9,186)	131,907	(13,922)	(11,711,948)	(11,603,089)	11,309	(11,591,780)
Balance (in shares) at Dec. 31, 2017 \| shares																36,727,350	(12,877,007)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accretion on convertible redeemable preferred shares to redemption value	¥ (7,091,163)	¥ (7,091,163)	¥ (7,091,163)	¥ (565,979)	¥ (565,979)	¥ (565,979)	¥ (2,417,979)	¥ (2,417,979)	¥ (2,417,979)	¥ (2,375,943)	¥ (2,375,943)	¥ (2,375,943)	¥ (1,216,227)	¥ (1,216,227)	¥ (1,216,227)
Accretion on redeemable non-controlling interests to redemption value																				(63,297)	(63,297)		(63,297)
Issuance of ordinary shares																¥ 315		7,526,681			7,526,996		7,526,996
Issuance of ordinary shares (in shares) \| shares																184,000,000
Conversion of preferred shares																¥ 1,408		33,724,621			33,726,029		33,726,029
Conversion of preferred shares (in shares) \| shares																821,378,518
Exercise of share options																¥ 27		42,224			42,251		42,251
Exercise of share options (in shares) \| shares																16,026,060	(2,176,570)
Vesting of restricted shares																		56,183			56,183		56,183
Vesting of restricted shares (in shares) \| shares																	7,720,681
Vesting of share options																		437,320			437,320		437,320
Grant of restricted shares																¥ 1					1		1
Grant of restricted shares (in shares) \| shares																509,001	(509,001)
Cancellation of restricted shares																¥ (2)					(2)		(2)
Cancellation of restricted shares (in shares) \| shares																(909,917)	909,917
Capital injection by non-controlling interests																						14,500	14,500
Foreign currency translation adjustment																			(20,786)		(20,786)		(20,786)	$ (3,023)
Net loss																				(9,597,274)	(9,597,274)	(41,705)	(9,638,979)	(1,401,932)
Balance at Dec. 31, 2018																¥ 1,809	¥ (9,186)	¥ 41,918,936	¥ (34,708)	¥ (35,039,810)	¥ 6,837,041	¥ (15,896)	¥ 6,821,145	$ 992,094
Balance (in shares) at Dec. 31, 2018 \| shares																1,057,731,012	(6,931,980)

CONSOLIDATED STATEMENTS OF CASH FLOWS ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	¥ (9,638,979)	$ (1,401,932)	¥ (5,021,174)	¥ (2,573,254)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	474,223	68,973	167,858	46,087
Foreign exchange loss	36,597	5,323	49,503	(5,540)
Share-based compensation expenses	679,468	98,825	90,296	76,684
Investment income			(3,498)	(2,670)
Share of losses of equity investee	9,722	1,414	5,375
Loss on disposal of property, plant and equipment	21,547	3,134	6,192	267
Changes in operating assets and liabilities:
Prepayments and other current assets	(811,138)	(117,975)	(404,762)	(209,784)
Inventory	(1,375,862)	(200,111)	(89,464)
Other non-current assets	(657,986)	(95,700)	(66,698)	(20,286)
Taxes payable	21,398	3,112	9,650	15,633
Trade receivable	(756,508)	(110,030)
Trade payable	2,827,144	411,191
Long-term receivables	(574,677)	(83,583)
Non-current deferred revenue	193,524	28,147
Accruals and other liabilities	1,348,622	196,149	603,374	410,100
Other non-current liabilities	291,137	42,344	78,629	61,199
Net cash used in operating activities	(7,911,768)	(1,150,719)	(4,574,719)	(2,201,564)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of property, plant and equipment and intangible assets	(2,643,964)	(384,549)	(1,113,893)	(654,455)
Purchases of short-term investments	(8,090,703)	(1,176,744)
Proceeds from sale of short-term investments	2,936,000	427,023
Purchase of held for trading securities			(1,337,413)	(2,346,261)
Sale of held for trading securities			1,340,911	3,118,559
Loan to related parties	(65,342)	(9,504)
Loan repayment from related parties	34,066	4,955
Acquisitions of equity investees	(110,900)	(16,130)	(52,500)
Acquisition of additional interests in subsidiaries from non-controlling interests			(27,378)
Net cash provided by/(used in) investing activities	(7,940,843)	(1,154,949)	(1,190,273)	117,843
CASH FLOWS FROM FINANCING ACTIVITIES
Repurchase of ordinary shares				(8,408)
Proceeds from exercise of stock options	42,251	6,145	6,207
Capital injection from non-controlling interests	14,500	2,109	13,376
Deposit from non-controlling interest	47,124	6,854
Proceeds from issuance of redeemable non-controlling interests	1,265,900	184,118
Repayment of non-recourse loan	82,863	12,052
Repurchase of restricted shares	(7,490)	(1,089)
Proceeds from issuance of convertible promissory note			312,624
Repayment of convertible promissory note			(325,013)
Proceeds from borrowings	2,668,461	388,112	633,688	37,500
Repayments of borrowings	(120,205)	(17,483)
Proceeds from issuance of ordinary share, net	7,531,037	1,095,344
Net cash provided by financing activities	11,603,092	1,687,601	12,867,334	2,292,704
Effects of exchange rate changes on cash, cash equivalents and restricted cash	(56,947)	(8,283)	(168,120)	40,539
NET INCREASE/(DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(4,306,466)	(626,350)	6,934,222	249,522
Cash, cash equivalents and restricted cash at beginning of the year	7,530,853	1,095,317	596,631	347,109
Cash, cash equivalents and restricted cash at end of the year	3,224,387	468,967	7,530,853	596,631
NON-CASH FINANCING ACTIVITIES
Issuance of series D convertible redeemable preferred shares			85,553
Capital injection from non-controlling interests in the form of net assets				25,355
Accrual related to purchase of property and equipment	1,027,377	149,426	410,726	190,681
Total	1,027,377	149,426	496,279	216,036
Supplemental Disclosure
Interest paid	112,682	16,389	15,434	55
Income taxes paid	11,157	1,623	1,129
Series A convertible redeemable preferred shares
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of convertible redeemable preferred shares, net of issuance costs			273,686	401,478
Series B convertible redeemable preferred shares
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of convertible redeemable preferred shares, net of issuance costs			240,066	¥ 1,862,134
Series C convertible redeemable preferred shares
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of convertible redeemable preferred shares, net of issuance costs			4,398,313
Series D convertible redeemable preferred shares
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of convertible redeemable preferred shares, net of issuance costs	¥ 78,651	$ 11,439	¥ 7,314,387

Organization and Nature of Operations

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Nature of Operations

1. Organization and Nature of Operations

NIO Inc. (“NIO”, or “the Company”) was incorporated under the laws of the Cayman Islands in November, 2014, as an exempted company with limited liability. The Company was formerly known as NextCar Inc.. It changed its name to NextEV Inc. in December, 2014, and then changed to NIO Inc. in July, 2017. The Company, its subsidiaries and consolidated variable interest entities (“VIEs”) are collectively referred to as the “Group”.

The Group designs and develops high-performance fully electric vehicles. It launched the first volume manufactured electric vehicle, the ES8, to the public in December 2017. The Group jointly manufactures ES8 through strategic collaboration with other Chinese vehicle manufacturers. The Group also offers Energy and Service packages to its users. As of December 31, 2017 and 2018, its primary operations are conducted in the People’s Republic of China (“PRC”). The Group began to sell its first vehicles in June 2018. The Company’s principal subsidiaries and VIEs are as follows:

Subsidiaries	Equity interest held			Place and date of incorporation or date of acquisition	Principal activities
NIO NextEV Limited (“NIO HK”) (formerly known as NextEV Limited)		100	%	Hong Kong, February 2015	Investment holding
NIO GmbH (formerly known as NextEV GmbH)		100	%	Germany, May 2015	Design and technology development
NIO Co., Ltd. (“NIO SH”) (formerly known as NextEV Co., Ltd.)		100	%	Shanghai, PRC, May 2015	Headquarter and technology development
NIO USA, Inc. (“NIO US”) (formerly known as NextEV USA, Inc.)		100	%	United States, November 2015	Technology development
XPT Limited (“XPT”)		100	%	Hong Kong, December 2015	Investment holding
NIO NextEV (UK) Limited (formerly known as NextEV (UK) Limited)		100	%	United Kingdom, February 2016	Marketing and technology development
NIO Sport Limited (“NIO Sport”) (formerly known as NextEV NIO Sport Limited)		100	%	Hong Kong, April 2016	Racing management
XPT Technology Limited (“XPT Technology”)		100	%	Hong Kong, April 2016	Investment holding
XPT Inc. (“XPT US”)		100	%	United States, April 2016	Technology development
XPT (Jiangsu) Investment Co., Ltd. (“XPT Jiangsu”)		100	%	Jiangsu, PRC, May 2016	Investment holding
Shanghai XPT Technology Limited		100	%	Shanghai, PRC, May 2016	Technology development
XPT (Nanjing) E-Powertrain Technology Co., Ltd. (“XPT NJEP”)		100	%	Nanjing, PRC, July 2016	Manufacturing of E-Powertrain
XPT (Nanjing) Energy Storage System Co., Ltd. (“XPT NJES”)		100	%	Nanjing, PRC, October 2016	Manufacturing of battery pack
NIO Power Express Limited (“PE HK)		100	%	Hong Kong, January 2017	Investment holding
NextEV User Enterprise Limited (“UE HK”)		100	%	Hong Kong, February 2017	Investment holding
Shanghai NIO Sales and Services Co., Ltd. (“UE CNHC”)		100	%	Shanghai, PRC, March 2017	Investment holding and sales and after sales management
NIO Energy Investment (Hubei) Co., Ltd. (“PE CNHC”)		100	%	Wuhan PRC, April 2017	Investment holding
Wuhan NIO Energy Co., Ltd. (“PE WHJV”)		100	%	Wuhan, PRC, May 2017	Investment holding
XTRONICS (Nanjing) Automotive Intelligent Technologies Co. Ltd. (“XPT NJWL”)		50	%	Nanjing, PRC, June 2017	Manufacturing of components
XPT (Jiangsu) Automotive Technology Co., Ltd. (“XPT AUTO”)		100	%	Nanjing, PRC, May 2018	Investment holding

VIE and VIE’s subsidiaries	Economic interest held			Place and Date of incorporation or date of acquisition
Prime Hubs Limited (“Prime Hubs”)		100	%	BVI, October 2014
NIO Technology Co., Ltd. (“NIO SHTECH”) (formerly known as Shanghai NextEV Technology Co., Ltd.)		100	%	Shanghai, PRC, November 2014
Beijing NIO Network Technology Co., Ltd. (“NIO BJTECH”)		100	%	Beijing, PRC, July 2017
Shanghai Anbin Technology Co., Ltd. (“NIO ABTECH”)		100	%	Shanghai, PRC, April 2018

In accordance with the Article of Association of XPT NJWL, the Company has the power to control the board of directors of XPT NJWL to unilaterally govern the financial and operating policies of XPT NJWL and the non-controlling shareholder does not have substantive participating rights, therefore, the Group consolidates this entity.

Initial Public Offering

On September 12, 2018, the Company consummated its initial public offering (the “IPO”) on the New York Stock Exchange, where 160,000,000 ordinary shares were newly issued with the total net proceeds of RMB6,568,291 (US$956,362). Subsequently on October 12, 2018, over-allotment option were fully exercised and the Company received a net proceeds of RMB962,746 (US$138,982) associated with issuing additional 24,000,000 ordinary shares.

Variable interest entity

NIO SHTECH was established by Li Bin and Qin Lihong (the “Nominee Shareholders”) in November, 2014. In 2015, NIO SH, NIO SHTECH, and the Nominee Shareholders of NIO SHTECH entered into a series of contractual agreements, including a loan agreement, an equity pledge agreement, exclusive call option agreement and power of attorney that irrevocably authorized the Nominee Shareholders designated by NIO SH to exercise the equity owner’s rights over NIO SHTECH. These agreements provide the Company, as the only shareholder of NIO SH, with effective control over NIO SHTECH to direct the activities that most significantly impact NIO SHTECH’s economic performance and enable the Company to obtain substantially all of the economic benefits arising from NIO SHTECH. Management concluded that NIO SHTECH is a variable interest entity of the Company and the Company is the ultimate primary beneficiary of NIO SHTECH and shall consolidate the financial results of NIO SHTECH in the Group’s consolidated financial statements. In April 2018, the above mentioned contractual agreements were terminated. On the same date, NIO SHTECH became a subsidiary wholly owned by NIO ABTECH, who also became a VIE of the Group on that day. As of December 31, 2017 and 2018, NIO SHTECH did not have significant operations, nor any material assets or liabilities.

In October 2014, Prime Hubs, a British Virgin Islands (“BVI”) incorporated company and a consolidated variable interest entity of the Group, was established by the shareholders of the Group to facilitate the adoption of the Company’s employee stock incentive plans. The Company entered into a management agreement with Prime Hubs and Li Bin. The agreement provides the company with effective control over Prime Hubs and enables the Company to obtain substantially all of the economic benefits arising from Prime Hubs. As of December 31, 2017 and 2018, Prime Hubs held 26,900,001 ordinary shares and 4,250,002 Class A Ordinary Shares of the Company, respectively.

In April 2018, NIO SH entered into a series of contractual arrangements with the Nominee Shareholders as well as NIO ABTECH and NIO BJTECH separately, each including a loan agreement, an equity pledge agreement, exclusive call option agreement and power of attorney that irrevocably authorized the Nominee Shareholders designated by NIO SH to exercise the equity owner’s rights over NIO ABTECH and NIO BJTECH. These agreements provide the Company, as the only shareholder of NIO SH, with effective control over NIO ABTECH and NIO BJTECH to direct the activities that most significantly impact their economic performance and enable the Company to obtain substantially all of the economic benefits arising from them. Management concluded that NIO ABTECH and NIO BJTECH are variable interest entities of the Company and the Company is the ultimate primary beneficiary of them and shall consolidate the financial results of NIO ABTECH and NIO BJTECH in the Group’s consolidated financial statements. As of December 31, 2018, NIO ABTECH and NIO BJTECH did not have significant operations, nor any material assets or liabilities.

Liquidity

The Group has been incurring losses from operations since inception. The Group incurred net losses of RMB2,573,254, RMB5,021,174 and RMB9,638,979 for the years ended December 31, 2016, 2017 and 2018, respectively. Accumulated deficit amounted to RMB11,711,948 and RMB35,039,810 as of December 31, 2017 and 2018, respectively. Net cash used in operating activities was approximately RMB2,201,564, RMB4,574,719 and RMB7,911,768 for the years ended December 31, 2016, 2017 and 2018, respectively. As of December 31, 2017 and 2018, the Group’s working capital was RMB6,691,491 and RMB3,576,246.

The Group’s liquidity is based on its ability to generate cash from operating activities, obtain capital financing from equity interest investors and borrow funds on favorable economic terms to fund its general operations and capital expansion needs. The Group’s ability to continue as a going concern is dependent on management’s ability to successfully execute its business plan, which includes increasing revenue while controlling operating cost and expenses to generate positive operating cash flows and obtaining funds from outside sources of financing to generate positive financing cash flows. As of December 31, 2017 and 2018, the Group’s balance of cash and cash equivalents was RMB7,505,954 and RMB3,133,847. In addition, up to the date of this report, the Company has entered into loan facility agreements with several banks in China for a total principal amount of RMB 7,095,000, with respective expiration date from April 27, 2019 to December 15, 2025. Moreover, the Group can adjust the pace of its operation expansion and control the operating expenses of the Group.

Based on cash flows projection from operating and financing activities and existing balance of cash and cash equivalents, management is of the opinion that the Group has sufficient funds for sustainable operations and it will be able to meet its payment obligations from operations and debt related commitments for the next twelve months from the issuance of the consolidated financial statements. Based on the above considerations, the Group’s consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and liquidation of liabilities during the normal course of operations.

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

(a) Basis of presentation

The consolidated financial statements of the Group have been prepared in accordance with accounting principles generally accepted in the United States of America (“US GAAP”). Significant accounting policies followed by the Group in the preparation of the accompanying consolidated financial statements are summarized below.

(b) Principles of consolidation

The consolidated financial statements include the financial statements of the Company, its subsidiaries and the VIE for which the Company is the ultimate primary beneficiary.

A subsidiary is an entity in which the Company, directly or indirectly, controls more than one half of the voting power; has the power to appoint or remove the majority of the members of the board of directors (the “Board”): to cast majority of votes at the meeting of the Board or to govern the financial and operating policies of the investee under a statute or agreement among the shareholders or equity holders.

A VIE is an entity in which the Company, or its subsidiary, through contractual arrangements, bears the risks of, and enjoys the rewards normally associated with, ownership of the entity, and therefore the Company or its subsidiary is the primary beneficiary of the entity.

All significant transactions and balances between the Company, its subsidiaries and the VIE have been eliminated upon consolidation. The non-controlling interests in consolidated subsidiaries are shown separately in the consolidated financial statements.

(c) Use of estimates

The preparation of the consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, related disclosures of contingent assets and liabilities at the balance sheet date, and the reported revenue and expenses during the reported period in the consolidated financial statements and accompanying notes. Significant accounting estimates reflected in the Group’s consolidated financial statements mainly include, but are not limited to, standalone selling price of each distinct performance obligation in revenue recognition, the valuation and recognition of share-based compensation arrangements, depreciable lives of property, equipment and software, assessment for impairment of long-lived assets, inventory valuation for excess and obsolete inventories, lower of cost and net realizable value of inventories, valuation of deferred tax assets as well as redemption value of the convertible redeemable preferred shares. Actual results could differ from those estimates.

(d) Functional currency and foreign currency translation

The Group’s reporting currency is the Renminbi (“RMB”). The functional currency of the Company and its subsidiaries which are incorporated in HK is United States dollars (“US$”), except NIO Sport which operates mainly in United Kingdom and uses Great Britain pounds (“GBP”). The functional currencies of the other subsidiaries and the VIE are their respective local currencies. The determination of the respective functional currency is based on the criteria set out by ASC 830, Foreign Currency Matters.

Transactions denominated in currencies other than in the functional currency are translated into the functional currency using the exchange rates prevailing at the transaction dates. Monetary assets and liabilities denominated in foreign currencies are translated into functional currency using the applicable exchange rates at the balance sheet date. Non-monetary items that are measured in terms of historical cost in foreign currency are re-measured using the exchange rates at the dates of the initial transactions. Exchange gains or losses arising from foreign currency transactions are included in the consolidated statements of comprehensive loss.

The financial statements of the Group’s entities of which the functional currency is not RMB are translated from their respective functional currency into RMB. Assets and liabilities denominated in foreign currencies are translated into RMB at the exchange rates at the balance sheet date. Equity accounts other than earnings generated in current period are translated into RMB at the appropriate historical rates. Income and expense items are translated into RMB using the periodic average exchange rates. The resulting foreign currency translation adjustments are recorded in other comprehensive income/(loss) in the consolidated statements of comprehensive gain or loss, and the accumulated foreign currency translation adjustments are presented as a component of accumulated other comprehensive loss in the consolidated statements of shareholders’ (deficit)/equity. Total foreign currency translation adjustment (gains)/losses were RMB(55,493), RMB124,374 and RMB20,786 for the years ended December 31, 2016, 2017 and 2018, respectively. The grant-date fair value of the Group’s share-based compensation expenses is reported in US$ as the respective valuation is conducted in US$ as the shares are denominated in US$.

(e) Convenience translation

Translations of balances in the consolidated balance sheets, consolidated statements of comprehensive loss and consolidated statements of cash flows from RMB into US$ as of and for the year ended December 31, 2018 are solely for the convenience of the reader and were calculated at the rate of US$1.00 = RMB6.8755, representing the noon buying rate in The City of New York for cable transfers of RMB as certified for customs purposes by the Federal Reserve Bank of New York on December 31, 2018. No representation is made that the RMB amounts represent or could have been, or could be, converted, realized or settled into US$ at that rate on December 31, 2018, or at any other rate.

(f) Fair value

Fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be either recorded or disclosed at fair value, the Group considers the principal or most advantageous market in which it would transact, and it also considers assumptions that market participants would use when pricing the asset or liability.

Accounting guidance establishes a fair value hierarchy that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Accounting guidance establishes three levels of inputs that may be used to measure fair value:

Level 1—Quoted prices (unadjusted) in active markets for identical assets or liabilities.

Level 2—Observable, market-based inputs, other than quoted prices, in active markets for identical assets or liabilities.

Level 3—Unobservable inputs to the valuation methodology that are significant to the measurement of the fair value of the assets or liabilities.

Financial assets and liabilities of the Group primarily consist of cash and cash equivalents, restricted cash, short-term investments, trade receivable, amounts due from related parties, prepayments and other current assets, trade payable, amounts due to related parties, short-term borrowings, taxes payable, accruals and other liabilities, long-term receivables and long-term borrowings. As of December 31, 2017 and 2018, the carrying values of these financial instruments except for long-term receivables and long-term borrowings are approximated to their fair values due to the short-term maturity of these instruments.

When available, the Group uses quoted market prices to determine the fair value of an asset or liability. If quoted market prices are not available, the Group will measure fair value using valuation techniques that use, when possible, current market-based or independently sourced market parameters, such as interest rates and currency rates. Below is a description of the valuation techniques that the Group uses to measure the fair value of assets that the Group reports on its consolidated balance sheets at fair value on a recurring basis.

Time deposits. The Group values its time deposits held in certain bank accounts using quoted prices for securities with similar characteristics and other observable inputs, and accordingly, the Group classifies the valuation techniques that use these inputs as Level 2.

Short-term borrowings. The rates of interest under the loan agreements with the lending banks were determined based on the prevailing interest rates in the market. The Group classifies the valuation techniques that use these inputs as Level 2.

Short-term receivables and payables. Trade receivable and prepayments and other current assets are financial assets with carrying values that approximate fair value due to their short term nature. Trade payable, accruals and other liabilities are financial liabilities with carrying values that approximate fair value due to their short term nature.

Prepayments and other assets in non-current assets. Prepayments and other assets in non-current assets are financial assets with carrying values that approximates fair value due to the change in fair value after considering the discount rate. The Group estimated fair values of non-current prepayments and other assets using the discount cash flow method.

(g) Cash, cash equivalents and restricted cash

Cash and cash equivalents represent cash on hand, time deposits and highly-liquid investments placed with banks or other financial institutions, which are unrestricted as to withdrawal and use, and which have original maturities of three months or less. The Group adopted ASU No. 2016-18, Statement of Cash Flows: Restricted Cash (Topic 230) for interim periods beginning after January 1, 2018, using a retrospective method to each period presented. The changes in restricted cash in the consolidated cash flow were RMB15,335, RMB9,564 and RMB65,641 for the years ended December 31, 2016, 2017 and 2018, respectively, which were no longer presented within investing activities and were retrospectively included in the changes of cash, cash equivalents and restricted cash as required.

Restricted cash is restricted to withdrawal for use or pledged as security is reported separately on the face of the Consolidated Balance Sheets, and is not included in the total cash and cash equivalents in the Consolidated Statements of Cash Flows. The Group’s restricted cash mainly represents (a) the secured deposits held in designated bank accounts for issuance of bank credit card; (b) time deposit that are pledged for property lease.

Cash, cash equivalents and restricted cash as reported in the consolidated statement of cash flows are presented separately on our consolidated balance sheet as follows:

	December 31, 2017		December 31 2018
Cash and cash equivalents		7,505,954		3,133,847
Restricted cash		10,606		57,012
Long-term restricted cash		14,293		33,528
Total		7,530,853		3,224,387

(h) Short-term investment

Short-term investments consist primarily of investments in fixed deposits with maturities between three months and one year and investments in money market funds. As of December 31, 2017 and 2018, the investment in fixed deposits that were recorded as short-term investments amounted to nil and RMB5,154,703, respectively, among which, nil and RMB1,775,000 were restricted as collateral for bank borrowings and letter of guarantee.

(i) Account Receivable and Allowance for Doubtful Accounts

Accounts receivable primarily include amounts of vehicle sales in relation of government subsidy to be collected from government on behalf of customers, current portion of battery installment and receivables due from vehicle users. The Group provides an allowance against accounts receivable to the amount we reasonably believe will be collected. The Group writes off accounts receivable when they are deemed uncollectible. No allowance for doubtful accounts were recognized for the years ended December 31, 2016, 2017 and 2018.

(j) Inventory

Inventories are stated at the lower of cost or net realizable value. Cost is calculated on the average basis and includes all costs to acquire and other costs to bring the inventories to their present location and condition. The Group records inventory write-downs for excess or obsolete inventories based upon assumptions on current and future demand forecasts. If the inventory on hand is in excess of future demand forecast, the excess amounts are written off. The Group also reviews inventory to determine whether its carrying value exceeds the net amount realizable upon the ultimate sale of the inventory. This requires the determination of the estimated selling price of the vehicles less the estimated cost to convert inventory on hand into a finished product. Once inventory is written-down, a new, lower-cost basis for that inventory is established and subsequent changes in facts and circumstances do not result in the restoration or increase in that newly established cost basis.

No inventory write-downs were recognized for the years ended December 31, 2016 and 2017 and 2018.

(k) Trading securities

Trading securities are comprised of bonds and are all designated as trading securities as they have been acquired principally for the purpose of selling in the near term. They are recognized on the trade date, when the Group enters into contractual arrangements with counterparties, and are normally derecognized when sold. They are initially measured at fair value, with transaction costs taken to the statements of operations and comprehensive loss. Subsequent changes in their fair values and interest are recognized in the statements of comprehensive loss.

(l) Property, plant and equipment, net

Property, plant and equipment are stated at cost less accumulated depreciation and impairment loss, if any. Property and equipment are depreciated at rates sufficient to write off their costs less impairment and residual value, if any, over their estimated useful lives on a straight-line basis. Leasehold improvements are amortized over the shorter of the lease term or the estimated useful lives of the related assets.

The estimated useful lives are as follows:

		Useful lives
Building and constructions		20 years
Production facilities		10 years
Charging & battery swap infrastructure		5 years
R&D equipment		5 years
Computer and electronic equipment		3 years
Purchased software		3 years
Leasehold improvements		Shorter of the estimated useful life or remaining lease term
Others		3 to 5 years

Depreciation for mold and tooling is computed using the units-of-production method whereby capitalized costs are amortized over the total estimated productive life of the related assets.

The cost of maintenance and repairs is expensed as incurred, whereas the cost of renewals and betterment that extends the useful lives of property, plant and equipment is capitalized as additions to the related assets. Interest expense on outstanding debt is capitalized during the period of significant capital asset construction. Capitalized interest on construction-in-progress is included within property, plant and equipment and is amortized over the life of the related assets. When assets are retired or otherwise disposed of, the cost and related accumulated depreciation and amortization are removed from their respective accounts, and any gain or loss on such sale or disposal is reflected in the statements of comprehensive loss.

(m) Intangible assets, net

Intangible assets are carried at cost less accumulated amortization and impairment, if any. Intangible assets are amortized using the straight-line method over the estimated useful lives as below:

		Useful lives
Domain names and others		5 years
License		3 years

The estimated useful lives of amortized intangible assets are reassessed if circumstances occur that indicate the original estimated useful lives have changed.

(n) Land use rights, net

Land use rights are recorded at cost less accumulated amortization. Amortization is provided on a straight-line basis over the estimated useful lives which are 536 months and represent the shorter of the estimated usage periods or the terms of the agreements.

(o) Long-term investments

As of December 31, 2018, the Group’s long-term investments was accounted for using equity method. Investments in entities in which the Group can exercise significant influence and holds an investment in voting common stock or in-substance common stock (or both) of the investee but does not own a majority equity interest or control are accounted for using the equity method of accounting in accordance with ASC topic 323, Investments—Equity Method and Joint Ventures (“ASC 323”). Under the equity method, the Group initially records its investments at fair value. The Group subsequently adjusts the carrying amount of the investments to recognize the Group’s proportionate share of each equity investee’s net income or loss into earnings after the date of investment. The Group evaluates the equity method investments for impairment under ASC 323. An impairment loss on the equity method investments is recognized in earnings when the decline in value is determined to be other-than-temporary. The carrying value of the Group’s long-term investments measured under equity method was RMB47,125 and RMB148,303 as of December 31, 2017 and 2018, respectively. No impairment charge was recognized for the years ended December 31, 2016, 2017 and 2018.

(p) Impairment of long-lived assets

Long-lived assets are evaluated for impairment whenever events or changes in circumstances (such as a significant adverse change to market conditions that will impact the future use of the assets) indicate that the carrying amount may not be fully recoverable or that the useful life is shorter than the Group had originally estimated. When these events occur, the Group evaluates the impairment by comparing carrying value of the assets to an estimate of future undiscounted cash flows expected to be generated from the use of the assets and their eventual disposition. If the sum of the expected future undiscounted cash flows is less than the carrying value of the assets, the Group recognizes an impairment loss based on the excess of the carrying value of the assets over the fair value of the assets. No impairment charge was recognized for the years ended December 31, 2016, 2017 and 2018.

(q) Revenue recognition

Revenue is recognized when or as the control of the goods or services is transferred to a customer. Depending on the terms of the contract and the laws that apply to the contract, control of the goods and services may be transferred over time or at a point in time. Control of the goods and services is transferred over time if the Group’s performance:

•

provides all of the benefits received and consumed simultaneously by the customer;

•

creates and enhances an asset that the customer controls as the Group performs; or

•

does not create an asset with an alternative use to the Group and the Group has an enforceable right to payment for performance completed to date.

If control of the goods and services transfers over time, revenue is recognized over the period of the contract by reference to the progress towards complete satisfaction of that performance obligation. Otherwise, revenue is recognized at a point in time when the customer obtains control of the goods and services.

Contracts with customers may include multiple performance obligations. For such arrangements, the Group allocates revenue to each performance obligation based on its relative standalone selling price. The Group generally determines standalone selling prices based on the prices charged to customers. If the standalone selling price is not directly observable, it is estimated using expected cost plus a margin or adjusted market assessment approach, depending on the availability of observable information. Assumptions and estimations have been made in estimating the relative selling price of each distinct performance obligation, and changes in judgments on these assumptions and estimates may impact the revenue recognition.

When either party to a contract has performed, the Group presents the contract in the statement of financial position as a contract asset or a contract liability, depending on the relationship between the entity’s performance and the customer’s payment.

A contract asset is the Group’s right to consideration in exchange for goods and services that the Group has transferred to a customer. A receivable is recorded when the Group has an unconditional right to consideration. A right to consideration is unconditional if only the passage of time is required before payment of that consideration is due.

If a customer pays consideration or the Group has a right to an amount of consideration that is unconditional, before the Group transfers a good or service to the customer, the Group presents the contract liability when the payment is made, or a receivable is recorded (whichever is earlier). A contract liability is the Group’s obligation to transfer goods or services to a customer for which the Group has received consideration (or an amount of consideration is due) from the customer. The Group’s contract liabilities primarily resulted from the multiple performance obligations identified in the vehicle sales contract and the sales of Energy and Service Packages, which is recorded as deferred revenue and advance from customers.

Vehicle sales

The Group generates revenue from sales of electric vehicles, currently the ES8, together with a number of embedded products and services through a series of contracts. The Group identifies the users who purchase the ES8 as its customers. There are multiple distinct performance obligations explicitly stated in a series of contracts including sales of ES8, charging piles, vehicle internet connection services and extended lifetime warranty which are accounted for in accordance with ASC 606. The standard warranty provided by the Group is accounted for in accordance with ASC 460, Guarantees, and the estimated costs are recorded as a liability when NIO transfers the control of ES8 to a user.

Customers only pay the amount after deducting the government subsidies to which they are entitled for the purchase of electric vehicles, which is applied on their behalf and collected by the Group or Jianghuai Automobile Group Co., Ltd. (“JAC”) from the government. The Group has concluded that government subsidies should be considered as a part of the transaction price it charges the customers for the electric vehicle, as the subsidy is granted to the buyer of the electric vehicle and the buyer remains liable for such amount in the event the subsidies were not received by the Group. For efficiency reason, the Group or JAC applies and collects the payment on a customer’ behalf. In the instance that some eligible customer selects installment payment for battery, the Group believes such arrangement contains a significant financing component and as a result adjusts the amount considering the impact of time value on the transaction price using an appropriate discount rate (i.e. the interest rates of the loan reflecting the credit risk of the borrower). The long term receivable of installment payment for battery was recognized as non-current assets. The difference between the gross receivable and the present value is recorded as unrealized finance income. Interest income resulting from a significant financing component will be presented separately from revenue from contracts with customers as this is not the Group’s ordinary business.

The Group uses a cost plus margin approach to determine the estimated standalone selling price for each individual distinct performance obligation identified, considering the Group’s pricing policies and practices, and the data utilized in making pricing decisions. The overall contract price is then allocated to each distinct performance obligation based on the relative estimated standalone selling price in accordance with ASC 606. The revenue for sales of the ES8 and charging piles are recognized at a point in time when the control of the product is transferred to the customer. For the vehicle internet connection service, the Group recognizes the revenue using a straight-line method. As for the extended lifetime warranty, given limited operating history and lack of historical data, the Group decides to recognize the revenue over time based on a straight-line method initially, and will continue monitoring the cost pattern periodically and adjust the revenue recognition pattern to reflect the actual cost pattern as it becomes available.

As the consideration for the vehicle and all embedded services must be paid in advance, which means the payments received are prior to the transfer of goods or services by the Group, the Group records a contract liability (deferred revenue) for the allocated amount regarding those unperformed obligations.

Sales of Energy and Service Packages

The Group also sells the two packages, Energy Package and Service Package in exchange of considerations. The Energy Package provides ES8 users with a comprehensive range of charging solutions (including charging and battery swapping). The energy service is applied by users on the mobile application depending on their needs and the Group can decide the most appropriate service to offer according to its available resource. Through the Service Package, the Group offers ES8 users with a “worry free” vehicle ownership experience (including free repair service with certain limitations, routine maintenance service, enhanced data package, etc.), which can be applied by user via mobile application.

The Group identifies the users who purchase Energy Package and Service Package meet the definition of a customer. The agreements for Energy Package and Service Package create legal enforceability to both parties on a monthly basis as the respective Energy or Service Packages can be canceled at any time without any penalty. The Group concludes the energy or service provided in Energy Package or Service Package respectively meets the stand-ready criteria and contains only one performance obligation within each package, the revenue is recognized overtime on a monthly basis as customer simultaneously receives and consumes the benefits provided and the term of legally enforced contract is only one month.

Incentives

The Group offers a self-managed customer loyalty program points, which can be used in the Group’s online store and at NIO houses to redeem NIO merchandise. The Group determines the value of each points based on cost of the NIO merchandise that can be redeemed with points. Customers and NIO fans and advocates have a variety of ways to obtain the points. The major accounting policy for its points program is described as follows:

(i) Sales of ES8 vehicle

The Group concludes the points offered linked to the purchase transaction of the ES8 vehicle is a material right and accordingly a separate performance obligation according to ASC 606, and should be taken into consideration when allocating the transaction price of the ES8 sales. The Group also estimates the probability of points redemption when performing the allocation. Since historical information does not yet exist for the Group to determine any potential points forfeitures and the fact that most merchandise can be redeemed without requiring a significant amount of points compared with the amount of points provided to users, the Group believes it is reasonable to assume all points will be redeemed and no forfeiture is estimated currently. The amount allocated to the points as separate performance obligation is recorded as contract liability (deferred revenue) and revenue should be recognized when future goods or services are transferred. The Group will continue to monitor when and if forfeiture rate data becomes available and will apply and update the estimated forfeiture rate at each reporting period.

(ii) Sales of Energy Package

Energy Package—When the customers charge their ES8 without using the Group’s charging network, the Group will grant points based on the actual cost the customers incur. The Group records the value of the points as a reduction of revenue from the Energy Package.

Since historical information does not yet exist for the Group to determine any potential points forfeiture and most merchandise can be redeemed without requiring a significant amount of points compared with the amount of points provided to users, the Group has used an estimated forfeiture rate of zero.

(iii) Other scenarios

Customers or users of the mobile application can also obtain points through any other ways such as frequent sign-ins to the Group’s mobile application, sharing articles from the application to users’ own social media. The Group believes these points are to encourage user engagement and generate market awareness. As a result, the Group accounts for such points as selling and marketing expenses with a corresponding liability recorded under other current liabilities of its consolidated balance sheets upon the points offering. The Group estimates liabilities under the customer loyalty program based on cost of the NIO merchandise that can be redeemed, and its estimate of probability of redemption. At the time of redemption, the Group records a reduction of inventory and other current liabilities. In certain cases where merchandise is sold for cash in addition to points, the Group records other revenue.

Similar to the reasons above, the Group estimates no points forfeiture currently and continues to assess when and if a forfeiture rate should be applied.

For the years ended December 31, 2016, 2017 and 2018, the revenue portion allocated to the points as separate performance obligation was nil, nil and RMB47,310, respectively, which is recorded as contract liability (deferred revenue). For the years ended December 31, 2016, 2017 and 2018, the total points recorded as a reduction of revenue was nil, nil and RMB441, respectively. For the years ended December 31, 2016, 2017 and 2018, the total points recorded as selling and marketing expenses were nil, RMB16,460 and RMB153,057, respectively.

As of December 31, 2017 and 2018, liabilities recorded related to unredeemed points were RMB16,460 and RMB143,868, respectively.

Practical expedients and exemptions

The Group follows the guidance on immaterial promises when identifying performance obligations in the vehicle sales contracts and concludes that lifetime roadside assistance and out-of-town charging services are not performance obligations considering these two services are value-added services to enhance user experience rather than critical items for ES8 driving and forecasted that usage of these two services will be very limited. The Group also performs an estimation on the stand-alone fair value of each promise applying a cost plus margin approach and concludes that the standalone fair value of roadside assistance and out-of-town charging services are insignificant individually and in aggregate, representing less than 1% of ES8 gross selling price and aggregate fair value of each individual promises.

Considering the qualitative assessment and the result of the quantitative estimate, the Group concluded not to assess whether promises are performance obligation if they are immaterial in the context of the contract and the relative stand-alone fair value individually and in aggregate is less than 3% of the contract price, namely the road-side assistance and out-of-town charging services. Related costs are then accrued instead.

(r) Cost of Sales

Vehicle

Cost of vehicle revenue includes direct parts, material, processing fee, loss compensation to JAC, labor costs, manufacturing overhead (including depreciation of assets associated with the production), and reserves for estimated warranty expenses. Cost of vehicle revenue also includes adjustments to warranty expense and charges to write-down the carrying value of the inventory when it exceeds its estimated net realizable value and to provide for on-hand inventory that is either obsolete or in excess of forecasted demand.

Service and Other

Cost of service and other revenue includes direct parts, material, labor costs, vehicle internet connectivity costs, and depreciation of assets that are associated with sales of energy and service packages.

(s) Sales and marketing expenses

Sales and marketing expenses consist primarily of marketing and promotional expenses, salaries and other compensation-related expenses to sales and marketing personnel. Advertising expenses consist primarily of costs for the promotion of corporate image and product marketing. The Group expenses all advertising costs as incurred and classifies these costs under sales and marketing expenses. For the years ended December 31, 2016, 2017 and 2018, advertising costs totalled RMB4,095, RMB63,427 and RMB218,060, respectively.

(t) Research and development expenses

Certain costs associated with developing internal-use software are capitalized when such costs are incurred within the application development stage of software development. Other than that, all costs associated with research and development (“R&D”) are expensed as incurred. R&D expenses are primary comprised of charges for R&D and consulting work performed by third parties; salaries, bonuses, share-based compensation, and benefits for those employees engaged in research, design and development activities; costs related to design tools; license expenses related to intellectual property, supplies and services; and allocated costs, including depreciation and amortization, rental fees, and utilities.

(u) General and administrative expenses

General and administrative expenses consist primarily of salaries, bonuses, share-based compensation and benefits for employees involved in general corporate functions and those not specifically dedicated to research and development activities, depreciation and amortization of fixed assets which are not used in research and development activities, legal and other professional services fees, rental and other general corporate related expenses.

(v) Employee benefits

Full time employees of the Group in the PRC participate in a government mandated defined contribution plan, pursuant to which certain pension benefits, medical care, employee housing fund and other welfare benefits are provided to the employees. Chinese labor regulations require that the PRC subsidiaries and VIE of the Group make contributions to the government for these benefits based on certain percentages of the employees’ salaries, up to a maximum amount specified by the local government. The Group has no legal obligation for the benefits beyond the contributions made. Total amounts of such employee benefit expenses, which were expensed as incurred, were approximately RMB105,955, RMB231,070 and RMB517,787 for the years ended December 31, 2016, 2017 and 2018, respectively.

(w) Government grants

The Group’s PRC based subsidiaries received government subsidies from certain local governments. The Group’s government subsidies consisted of specific subsidies and other subsidies. Specific subsidies are subsidies that the local government has provided for a specific purpose, such as product development and renewal of production facilities. Other subsidies are the subsidies that the local government has not specified its purpose for and are not tied to future trends or performance of the Group; receipt of such subsidy income is not contingent upon any further actions or performance of the Group and the amounts do not have to be refunded under any circumstances. The Group recorded specific purpose subsidies as advances payable when received. For specific subsidies, upon government acceptance of the related project development or asset acquisition, the specific purpose subsidies are recognized to reduce related R&D expenses or the cost of asset acquisition. Other subsidies are recognized as other income upon receipt as further performance by the Group is not required.

(x) Income taxes

Current income taxes are recorded in accordance with the regulations of the relevant tax jurisdiction. The Group accounts for income taxes under the asset and liability method in accordance with ASC 740, Income Tax. Under this method, deferred tax assets and liabilities are recognized for the tax consequences attributable to differences between carrying amounts of existing assets and liabilities in the financial statements and their respective tax basis, and operating loss carry-forwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred taxes of a change in tax rates is recognized in the consolidated statements of comprehensive loss in the period of change. Valuation allowances are established when necessary to reduce the amount of deferred tax assets if it is considered more likely than not that amount of the deferred tax assets will not be realized.

The Group records liabilities related to uncertain tax positions when, despite the Group’s belief that the Group’s tax return positions are supportable, the Group believes that it is more likely than not that those positions may not be fully sustained upon review by tax authorities. Accrued interest and penalties related to unrecognized tax benefits are classified as income tax expense. The Group did not recognize uncertain tax positions as of December 31, 2017 and 2018.

(y) Share-based compensation

The Company grants restricted shares and share options to eligible employees and non-employee consultants and accounts for share-based compensation in accordance with ASC 718, Compensation—Stock Compensation and ASC 505-50 Equity-Based Payments to Non-Employees.

Employees’ share-based compensation awards are measured at the grant date fair value of the awards and recognized as expenses a) immediately at the grant date if no vesting conditions are required; or b) for share options or restricted shares granted with only service conditions, using the straight-line vesting method, net of estimated forfeitures, over the vesting period; or c) for share options granted with service conditions and the occurrence of an IPO as performance condition, cumulative share-based compensation expenses for the options that have satisfied the service condition should be recorded upon the completion of the IPO, using the graded vesting method. This performance condition was met upon completion of the Company’s IPO on September 12, 2018 and the associated share-based compensation expense for awards vested as of that date were recognized; or d) for share options where the underlying share is liability within the scope of ASC 480, using the graded vesting method, net of estimated forfeitures, over the vesting period, and re-measuring the fair value of the award at each reporting period end until the award is settled.

All transactions in which goods or services are received in exchange for equity instruments are accounted for based on the fair value of the consideration received or the fair value of the equity instrument issued, whichever is more reliably measurable.

Share-based compensation expenses for share options and restricted shares granted to non-employees are measured at fair value at the earlier of the performance commitment date or the date service is completed, and recognized over the period during which the service is provided. The Group applies the guidance in ASC 505-50 to measure share options and restricted shares granted to non-employees based on the then-current fair value at each reporting date.

The fair value of the restricted shares were assessed using the income approaches / market approaches, with a discount for lack of marketability given that the shares underlying the awards were not publicly traded at the time of grant. This assessment required complex and subjective judgments regarding the Company’s projected financial and operating results, its unique business risks, the liquidity of its ordinary shares and its operating history and prospects at the time the grants were made. In addition, the binomial option-pricing model is used to measure the value of share options. The determination of the fair value is affected by the fair value of the ordinary shares as well as assumptions regarding a number of complex and subjective variables, including the expected share price volatility, actual and projected employee and non-employee share option exercise behavior, risk-free interest rates and expected dividends. The fair value of these awards was determined taking into account independent valuation advice.

The assumptions used in share-based compensation expense recognition represent management’s best estimates, but these estimates involve inherent uncertainties and application of management judgment. If factors change or different assumptions are used, the share-based compensation expenses could be materially different for any period. Moreover, the estimates of fair value of the awards are not intended to predict actual future events or the value that ultimately will be realized by grantees who receive share-based awards, and subsequent events are not indicative of the reasonableness of the original estimates of fair value made by the Company for accounting purposes.

Forfeitures are estimated at the time of grant and revised in subsequent periods if actual forfeitures differ from those estimates. The Group uses historical data to estimate pre-vesting options and records share-based compensation expenses only for those awards that are expected to vest.

(z) Comprehensive income/(loss)

The Group applies ASC 220, Comprehensive Income, with respect to reporting and presentation of comprehensive loss and its components in a full set of financial statements. Comprehensive loss is defined to include all changes in equity of the Group during a period arising from transactions and other event and circumstances except those resulting from investments by shareholders and distributions to shareholders. For the years presented, the Group’s comprehensive loss includes net loss and other comprehensive loss, which mainly consists of the foreign currency translation adjustment that have been excluded from the determination of net loss.

(aa) Leases

Leases are classified at the inception date as either a capital lease or an operating lease. As the lessee, a lease is a capital lease if any of the following conditions exists: a) ownership is transferred to the lessee by the end of the lease term, b) there is a bargain purchase option, c) the lease term is at least 75% of the property’s estimated remaining economic life, or d) the present value of the minimum lease payments at the beginning of the lease term is 90% or more of the fair value of the leased property to the lessor at the inception date. A capital lease is accounted for as if there was an acquisition of an asset and an incurrence of an obligation at the inception of the lease.

All other leases are accounted for as operating leases wherein rental payments are expensed as incurred. Payments made under operating lease to the lessors are charged to the consolidated statement of comprehensive loss on a straight-line basis over the lease period. Operating lease expenses recorded in the accompanying consolidated statements of comprehensive loss amounted to RMB102,020, RMB228,478 and RMB490,936 for the years ended December 31, 2016, 2017 and 2018, respectively.

(ab) Dividends

Dividends are recognized when declared. No dividends were declared for the years ended December 31, 2016, 2017 and 2018, respectively.

(ac) Earnings/(Loss) per share

Basic earnings/(loss) per share is computed by dividing net income/(loss) attributable to holders of ordinary shares, considering the accretions to redemption value of the preferred shares, by the weighted average number of ordinary shares outstanding during the period using the two-class method. Under the two-class method, net income is allocated between ordinary shares and other participating securities based on their participating rights. Diluted earnings/(loss) per share is calculated by dividing net income/(loss) attributable to ordinary shareholders, as adjusted for the accretion and allocation of net income related to the preferred shares, if any, by the weighted average number of ordinary and dilutive ordinary equivalent shares outstanding during the period. Ordinary equivalent shares consist of shares issuable upon the conversion of the preferred shares using the if-converted method, unvested restricted shares, restricted share units and ordinary shares issuable upon the exercise of outstanding share options (using the treasury stock method). Ordinary equivalent shares are not included in the denominator of the diluted earnings per share calculation when inclusion of such shares would be anti-dilutive.

(ad) Segment reporting

ASC 280, Segment Reporting, establishes standards for companies to report in their financial statements information about operating segments, products, services, geographic areas, and major customers.

Based on the criteria established by ASC 280, the Group’s chief operating decision maker (“CODM”) has been identified as the Chief Executive Officer, who reviews consolidated results when making decisions about allocating resources and assessing performance of the Group. As a whole and hence, the Group has only one reportable segment. The Group does not distinguish between markets or segments for the purpose of internal reporting. As the Group’s long-lived assets are substantially located in the PRC, no geographical segments are presented.

Recent Accounting Pronouncements

12 Months Ended

Dec. 31, 2018

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recent Accounting Pronouncements

3. Recent Accounting Pronouncements

In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606).” This guidance supersedes current guidance on revenue recognition in Topic 605, “Revenue Recognition.” In addition, there are disclosure requirements related to the nature, amount, timing, and uncertainty of revenue recognition. In August 2015, the FASB issued ASU No. 2015-14 to defer the effective date of ASU No. 2014-09 for all entities by one year. For publicly-traded business entities that follow U.S. GAAP, the deferral results in the new revenue standards’ being effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017, with early adoption permitted for interim and annual periods beginning after December 15, 2016. The Group adopted this ASU after starting to generate revenue in June 2018.

In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). The main objective of this update is to enhance the reporting model for financial instruments to provide users of financial statements with more decision-useful information. ASU 2016-01 changes how entities measure certain equity investments and present changes in the fair value of financial liabilities measured under the fair value option that are attributable to their own credit. The guidance also changes certain disclosure requirements and other aspects of current U.S. GAAP. Further, in June 2018, the FASB issued “Technical Corrections and Improvements to Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities,” which provides further guidance on adjustments for observable transaction for equity securities without a readily determinable fair value and clarification on fair value option for liabilities instruments. ASU 2016-01 was effective for annual reporting periods and interim periods within those years beginning after December 15, 2017. The adoption of ASU 2016-01 had no impact on the Group’s consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The ASU is effective for reporting periods beginning after December 15, 2018 and interim periods within those fiscal years. The ASU will require lessees to report most leases as assets and liabilities on the balance sheet, while lessor accounting will remain substantially unchanged. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. If a lessee makes this election, it should recognize lease expenses for such lease generally on a straight-line basis over the lease term. The Group decides to make this election. The new leases standard also provides lessees with a practical expedient, by class of underlying asset, to not separate non-lease components from the associated lease component. If a lessee makes that accounting policy election, it is required to account for the non-lease components together with the associated lease component as a single lease component and to provide certain disclosures. The Group elects not to adopt this practical expedient. The ASU initially required a modified retrospective transition approach for existing leases, whereby the new leases standard will be applied to the earliest year presented. In July 2018, the FASB issued ASU 2018-11, which provides another transition method, the additional transition method, in addition to the existing transition method by allowing entities to initially apply the new leases standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Group will adopt this new guidance by using the additional transition method for the year ended December 31, 2019 and interim periods in the year ended December 31, 2019. Most of leases will continue to be operating leases. Upon the adoption, the Group expects its consolidated balance sheet to include a right of use asset and liability related to substantially all of our lease arrangements. The Group estimated approximately RMB1.8 to 2.0 billion would be recognized as total right-of-use assets and total lease liabilities on the Group’s consolidated balance sheet as of January 1, 2019. Other than disclosed, the Group does not expect the new standard to have a material impact on the Group’s remaining consolidated financial statements.

In March 2016, the FASB issued ASU No. 2016-09, Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”). ASU 2016-09 simplifies the accounting for share-based payment transactions specifically related to the tax effects associates with share-based compensation, an accounting policy election to determine how forfeitures are recorded and a change in the presentation requirements in the statement of cash flows. Non-public companies are also granted two additional optional provisions that would provide a practical expedient for determining the expected term and a one-time opportunity to change the measurement basis for all liability-classified awards to intrinsic value. There was no significant impact upon adoption in 2018.

In June 2016, the FASB issued ASU No. 2016-13 (ASU 2016-13), “Financial Instruments – Credit Losses”, which introduces new guidance for credit losses on instruments within its scope. The new guidance introduces an approach based on expected losses to estimate credit losses on certain types of financial instruments, including, but not limited to, trade and other receivables, held-to-maturity debt securities, loans and net investments in leases. The new guidance also modifies the impairment model for available-for-sale debt securities and requires the entities to determine whether all or a portion of the unrealized loss on an available-for-sale debt security is a credit loss. The standard also indicates that entities may not use the length of time a security has been in an unrealized loss position as a factor in concluding whether a credit loss exists. The ASU 2016-13 is effective for public companies for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted for all entities for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Group is in the process of evaluating the impact of adopting this guidance.

In August 2016, the FASB issued ASU No. 2016-15, Classification of Certain Cash Receipts and Cash Payments, to reduce the diversity in practice with respect to the classification of certain cash receipts and cash payments on the statement of cash flows. The ASU is effective for interim and annual periods beginning after December 15, 2017. Adoption of the ASU is retrospective. The Group adopted the ASU on January 1, 2018, which did not have a material impact on the consolidated financial statements.

In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows: Restricted Cash (Topic 230). The ASU requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The standard should be applied to each period presented using a retrospective transition method. The adoption of this standard did not have a material impact on the Group’s consolidated financial statements, but resulted in restricted cash being included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statements of cash flows.

Concentration and Risks

12 Months Ended

Dec. 31, 2018

Risks and Uncertainties [Abstract]

Concentration and Risks

4. Concentration and Risks

(a) Concentration of credit risk

Assets that potentially subject the Group to significant concentrations of credit risk primarily consist of cash and cash equivalents, restricted cash and short-term investment. The maximum exposure of such assets to credit risk is their carrying amounts as of the balance sheet dates. As of December 31, 2017 and 2018, all of the Group’s cash and cash equivalents, restricted cash and short-term investments were held by major financial institutions located in the PRC and Hong Kong which management believes are of high credit quality. The PRC does not have an official deposit insurance program, nor does it have an agency similar to the Federal Deposit Insurance Corporation (FDIC) in the United States. However, the Group believes that the risk of failure of any of these PRC banks is remote. Bank failure is uncommon in China and the Group believes that those Chinese banks that hold the Group’s cash and cash equivalents and restricted cash are financially sound based on publicly available information.

(b) Currency convertibility risk

The PRC government imposes controls on the convertibility of RMB into foreign currencies. The Group’s cash and cash equivalents and restricted cash denominated in RMB that are subject to such government controls amounted to RMB914,460 and RMB2,051,482 as of December 31, 2017 and 2018, respectively. The value of RMB is subject to changes in the central government policies and to international economic and political developments affecting supply and demand in the PRC foreign exchange trading system market. In the PRC, certain foreign exchange transactions are required by law to be transacted only by authorized financial institutions at exchange rates set by the People’s Bank of China (the “PBOC”). Remittances in currencies other than RMB by the Group in the PRC must be processed through PBOC or other Chinese foreign exchange regulatory bodies which require certain supporting documentation in order to process the remittance.

(c) Foreign currency exchange rate risk

Since July 21, 2005, the RMB has been permitted to fluctuate within a narrow and managed band against a basket of certain foreign currencies. While the international reaction to the RMB appreciation has generally been positive, there remains significant international pressure on the PRC government to adopt an even more flexible currency policy, which could result in a further and more significant appreciation of the RMB against other currencies.

Inventory

12 Months Ended

Dec. 31, 2018

Inventory Disclosure [Abstract]

Inventory

5. Inventory

Inventory consists of the following:

	December 31, 2017		December 31, 2018
Raw materials		44,061		696,005
Work in process		22,262		6,727
Finished Goods		-		723,591
Merchandise		23,141		38,916
Total		89,464		1,465,239

Raw materials as of December 31, 2017 are mainly used for research and development purpose and will be expensed when incurred. In the second quarter of 2018, the Group started selling vehicles and procured raw materials for volume production purpose. As of December 31, 2018, raw materials primarily consist of materials for volume production as well as spare parts used for aftersales services.

Work in progress are mainly used for research and development of new models and will be expensed when incurred. Electric drive systems in production are also recorded as work in progress.

Finished goods include vehicles ready for transit at production factory, vehicles in transit to fulfill customer orders, new vehicles available for immediate sale at our sales and service center locations, and charging piles.

Merchandise inventory includes branded merchandise of NIO which can be redeemed by deducting membership rewards points of customer loyalty program in the Group’s application store.

Prepayments and Other Current Assets

12 Months Ended

Dec. 31, 2018

Prepayments And Other Current Assets [Abstract]

Prepayments and Other Current Assets

6. Prepayments and Other Current Assets

Prepayments and other current assets consist of the following:

	December 31, 2017		December 31, 2018
Deductible VAT input		456,774		1,018,766
Prepayment to vendors		185,401		333,367
Deposits		12,582		23,321
Other receivables		19,668		138,803
Total		674,425		1,514,257

Prepayment to vendors mainly consist of prepayment for raw materials, prepaid rental for offices and NIO Houses, and prepaid expenses for R&D services provided by suppliers.

Property, Plant and Equipment, Net

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment, Net [Abstract]

Property, Plant and Equipment, Net

7. Property, Plant and Equipment, Net

Property and equipment and related accumulated depreciation were as follows:

	December 31, 2017			December 31, 2018
Construction in process		1,016,643			1,289,611
Mold and tooling		2,619			1,032,685
Leasehold improvements		413,368			653,298
Building and construction		-			481,121
Charging & battery swap infrastructure		-			470,506
Production facilities		134,080			456,569
Computer and electronic equipment		178,534			393,931
R&D equipment		173,741			320,362
Purchased software		135,775			286,034
Others		77,681			146,869
Subtotal		2,132,441			5,530,986
Less: Accumulated depreciation		(221,428	)		(677,829	)
Total property, plant and equipment, net		1,911,013			4,853,157

The Group recorded depreciation expenses of RMB45,013, RMB165,960 and RMB469,408 for the years ended December 31, 2016, 2017 and 2018, respectively.

Intangible Assets, Net

12 Months Ended

Dec. 31, 2018

Finite-Lived Intangible Assets, Net [Abstract]

Intangible Assets, Net

8. Intangible Assets, Net

Intangible assets and related accumulated amortization were as follows:

	December 31, 2017							December 31, 2018
	Gross carrying value		Accumulated amortization			Net carrying value		Gross carrying value		Accumulated amortization			Net carrying value
Domain names and others		4,230		(1,017	)		3,213		5,269		(1,974	)		3,295
License		3,199		(1,955	)		1,244		3,161		(2,986	)		175
Total intangible assets, net		7,429		(2,972	)		4,457		8,430		(4,960	)		3,470

The Group recorded amortization expenses of RMB1,074, RMB1,898 and RMB1,988 for the years ended December 31, 2016, 2017 and 2018, respectively.

Land Use Rights, Net

12 Months Ended

Dec. 31, 2018

Land Use Rights, Net [Abstract]

Land Use Rights, Net

9. Land Use Rights, Net

Land use rights and related accumulated amortization were as follows:

	December 31, 2017		December 31, 2018
Land use rights		—		216,489
Less: Accumulated amortization—land use rights		—		(2,827	)
Total land use rights, net		—		213,662

In June 2018, XPT NJEP entered into an agreement to purchase land use rights for usage of land to build a factory for manufacturing of e-powertrain for the Group.

The Group recorded amortization expenses for land use rights of nil, nil and RMB2,827 for the years ended December 31, 2016, 2017 and 2018, respectively.

Other Non-current Assets

12 Months Ended

Dec. 31, 2018

Other Assets, Noncurrent [Abstract]

Other Non-current Assets

10. Other Non-current Assets

Other non-current assets consist of the following:

	December 31, 2017		December 31, 2018
Long-term deposits		80,168		616,199
Receivables of installment payments for battery		-		574,677
Prepayments for purchase of property and equipment		50,882		159,341
Others		91		62,613
Total		131,141		1,412,830

Long-term deposit mainly consists of deposits to vendors for guarantee of production capacity as well as rental deposit for offices and NIO Houses which will not be collectible within one year.

Accruals and Other Liabilities

12 Months Ended

Dec. 31, 2018

Accruals And Other Liabilities [Abstract]

Accruals and Other Liabilities

11. Accruals and Other Liabilities

Accruals and other liabilities consist of the following:

	December 31, 2017		December 31, 2018
Payables for purchase of property and equipment		410,726		1,027,377
Payable for R&D expenses		247,923		437,731
Payables for marketing events		37,933		423,953
Salaries and benefits payable		170,274		402,163
Accrued expenses		199,087		308,486
Advance from customers		68,439		233,767
Current portion of deferred revenue		-		108,250
Current portion of deferred construction allowance		-		87,330
Investment deposit from investors		-		47,124
Warranty		-		46,574
Payables for traveling expenses		10,678		43,147
Interest payables		24,320		2,584
Non-recourse loan		55,028		-
Other payables		61,184		215,195
Total		1,285,592		3,383,681

Borrowings

12 Months Ended

Dec. 31, 2018

Long Term Borrowings [Abstract]

Borrowings

12. Borrowings

Borrowings consist of the following:

	December 31, 2017		December 31, 2018
Short-term borrowing		28,787		1,870,000
Current portion of long-term borrowings		—		198,852
Long-term borrowings:
Bank loan		454,901		766,592
Loan from joint investor		187,500		401,420
Total		671,188		3,236,864

As of December 31, 2017, we obtained two short-term borrowings of RMB28,787 in aggregate. The annual interest rate of these borrowings is approximately 4.57% to 4.87%.

As of December 31, 2018, we obtained short-term borrowings from ten banks of RMB1,870,000 in aggregate collateralized by bank deposit of RMB1,375,000 classified as short-term investment provided by one of our wholly-owned subsidiaries. The annual interest rate of these borrowings is approximately 4.35% to 5.22%.

On May 17, 2017, the Group entered into a secured loan agreement with the Bank of Nanjing of a facility amount of RMB685,000 with a maturity date of May 17, 2022. As of December 31, 2017 and 2018, the aggregated draw amounted to RMB454,901 and RMB674,279, respectively. The annual interest rate of these borrowings is approximately 4.75% to 5.80%. The loan was guaranteed by Nanjing Xingzhi as an incentive for XPT NJES to continue doing business in the respective region. There is no restrictive financial covenants attached to the loan.

On September 28, 2017, the Group entered into a loan agreement with China Merchants Bank of a facility amount of RMB200,000 with a maturity date of September 27, 2019. As of December 31, 2018, the aggregated draw amounted to RMB99,500 subject to a floating interest of 10% to 18% above the benchmark interest rate of three-year RMB loan announced by PBOC.

On February 2, 2018, the Group entered into a loan agreement with China CITIC Bank of a principal of RMB50,000 with a maturity date of February 1, 2021. As of December 31, 2018, the aggregated draw amounted to RMB49,750 subject to a floating interest rate of 10% above the average quoted interest rate of one-year RMB loan announced by the National Interbank Funding Center.

On May 14, 2018, the Group entered into a loan agreement with Bank of Shanghai of a facility amount of RMB1,500,000 with a maturity date of December 15, 2025. As of December 31, 2018, the aggregated draw amounted to RMB27,000 subject to a floating interest rate of 20% above the benchmark interest rate of five-year RMB loan announced by PBOC. On August 17, 2018, the Group entered into a loan agreement with China CITIC Bank of a principal of RMB50,000 with a maturity date of March 7, 2021. As of December 31, 2018, the aggregated draw amounted to RMB50,000 subject to a floating interest rate of 26% above the average quoted interest rate of one-year RMB loan announced by the National Interbank Funding Center.

On November 30, 2018, the Group entered into a loan agreement with Bank of Shanghai of a principal of RMB5,200 with a maturity date of November 30, 2021. As of December 31, 2018, the aggregated draw amounted to RMB5,115 subject to a floating interest rate of 30% above the average quoted interest rate of three-year RMB loan announced by PBOC.

On December 20, 2018, the Group entered into a loan agreement with Bank of Shanghai of a principal of RMB19,800 with a maturity date of November 30, 2021. The loan is subject to a floating interest rate of 30% above the average quoted interest rate of three-year RMB loan announced by PBOC.

On December 24, 2018, the Group entered into a loan agreement with Bank of Shanghai of a principal of RMB40,000 with a maturity date of November 30, 2021. The loan is subject to a floating interest rate of 30% above the average quoted interest rate of three-year RMB loan announced by PBOC.

On September 7, 2016, the Group entered into a joint investment agreement with Nanjing Xingzhi Technology Industry Development Co., Ltd (“Nanjing Xingzhi”, formerly known as Nanjing Zijin (New Harbor) Technology Entrepreneurial Special Community Construction Development Co., Ltd). Nanjing Xingzhi invested in XPT NJES, a subsidiary of the Group, with a contribution of RMB37,500. According to the agreement, the annual rate of return on investment of Nanjing Xingzhi equals the benchmark interest rate of one-year RMB loan announced by PBOC. Given Nanjing Xingzhi does not bear the risk of the losses and only entitles to fixed interest income, the Group regarded it a loan in substance and recorded it in liability with the interest expenses amortized through the period. On May 16, 2018, the Group entered into an agreement with Nanjing Xingzhi to purchase Nanjing Xingzhi’s shareholding in XPT NJES at a price of RMB41,773, which approximately the entire principal plus interest accrued so far.

On May 18, 2017, the Group entered into a joint investment agreement with Wuhan Donghu New Technology Development Zone Management Committee (“Wuhan Donghu”) to set up a joint venture entity (the “PE WHJV”). Wuhan Donghu subscribed for RMB384,000 paid in capital in PE WHJV with 49% of the shares. On June 30, 2017, September 29, 2017 and April 16, 2018, Wuhan Donghu injected RMB50,000, RMB100,000 and RMB234,000 in cash to PE WHJV, respectively. Pursuant to the investment agreement, Wuhan Donghu does not have substantive participating rights to PE WHJV, nor is allowed to transfer its equity interest in PE WHJV to other third party. In addition, within five years or when the net assets of PE WHJV is less than RMB550,000, the Group is obligated to purchase from Wuhan Donghu all of its interest in PE WHJV at its investment amount paid plus interest at the current market rate announced by PBOC. As such, the Group consolidates PE WHJV. The investment by Wuhan Donghu is accounted for as a loan because it is only entitled to fixed interest income and subject to repayment within five years or upon the financial covenant violation. As of December 31, 2017 and 2018, nil and RMB17,420 of interest were accrued at the benchmark rate of medium and long-term loan announced by PBOC.

Other Non-Current Liabilities

12 Months Ended

Dec. 31, 2018

Other Liabilities, Noncurrent [Abstract]

Other Non-Current Liabilities

13. Other Non-Current Liabilities

Other non-current liabilities consist of the following:

	December 31, 2017		December 31, 2018

Deferred government grants		30,416		351,896
Deferred revenue		—		193,524
Warranty		—		130,719
Rental payable		48,926		129,995
Deferred construction allowance		61,771		124,678
Total		141,113		930,812

Deferred government grants mainly consist of specific government subsidies for purchase of land use right and buildings, product development and renewal of production facilities.

Rental payable represents the difference between the straight-line rental expenses and the actual rental fee paid for long term rental agreements.

Deferred construction allowance consists of long-term payable of construction projects, with payment terms over one year.

Revenues

12 Months Ended

Dec. 31, 2018

Disaggregation of Revenue [Abstract]

Revenues

14. Revenues

Revenues by source consists of the following:

	For the Year Ended December 31,
	2016		2017		2018
Vehicle sales		—		—		4,852,470
Sales of charging pile		—		—		82,184
Sales of Packages		—		—		10,220
Others		—		—		6,297
Total		—		—		4,951,171

Deferred Revenue

12 Months Ended

Dec. 31, 2018

Deferred Revenue Disclosure [Abstract]

Deferred Revenue

15. Deferred Revenue

The following table shows a reconciliation in the current reporting period related to carried-forward deferred revenue.

	For the Year Ended December 31
	2016		2017		2018
Deferred revenue – beginning of year		—		—		—
Additions		—		—		384,116
Recognition		—		—		(82,342	)
Deferred revenue – end of year		—		—		301,774

Deferred revenue mainly includes the transaction price allocated to the performance obligations that are unsatisfied, or partially satisfied, which mainly arises from the undelivered charging pile, the vehicle internet connection service, the extended lifetime warranty service as well as the points offered to customers embedded in the ES8 sales contract, with unrecognized deferred revenue balance of nil and RMB181,539 as of December 31, 2017 and 2018.

Deferred revenue also includes the reimbursement from a depository bank in connection with the advancement of the Company’s ADR and investor relations programs in the next five years. The Company initially recorded the payment from the depository bank as deferred revenue and then recognized as other gain over the beneficial period, with unrecognized deferred revenue balance of nil and RMB99,684 as of December 31, 2017 and 2018.

The Group expects that 36% of the transaction price allocated to unsatisfied performance obligation as at December 31, 2018 will be recognized as revenue during the period from January 1, 2019 to December 31, 2019. The remaining 64% will be recognized during the period from January 1, 2020 to December 31, 2023.

Manufacturing in collaboration with JAC

12 Months Ended

Dec. 31, 2018

Manufacturing In Collaboration With Jac [Abstract]

Manufacturing in collaboration with JAC

16. Manufacturing in collaboration with JAC

The Group entered into an arrangement with JAC for the manufacture of the ES8 for five years in May 2016. Pursuant to the arrangement, JAC will build up a new manufacturing plant (“Hefei Manufacturing Plant”) and is responsible for the equipment used on the product line while NIO is responsible for the tooling. For each vehicle produced the Group will pay processing fee to JAC on a per-vehicle basis monthly for the first three years on the basis that NIO will provide all the raw materials to JAC. In addition, for the first 36 months after agreed time of start of production, which is April 2018, the Group will compensate JAC operating losses incurred in Hefei Manufacturing Plant. For the years ended December 31, 2016, 2017 and 2018, JAC charged the Group nil, nil and RMB126,425, respectively, based on the actual losses incurred in Hefei Manufacturing Plant during the same periods, which was recorded into cost of sales.

Research and Development Expenses

12 Months Ended

Dec. 31, 2018

Research and Development Expense [Abstract]

Research and Development Expenses

17. Research and Development Expenses

Research and development expenses consist of the following:

	Year Ended December 31,
	2016		2017		2018
Employee compensation		451,284		1,004,835		1,850,886
Design and development expenses		948,753		1,455,297		1,827,980
Travel and entertainment expenses		27,085		60,622		104,949
Depreciation and amortization expenses		7,819		38,940		103,427
Rental and related expenses		10,485		12,367		33,105
Others		19,927		30,828		77,595
Total		1,465,353		2,602,889		3,997,942

Selling, General and Administrative Expenses

12 Months Ended

Dec. 31, 2018

Selling, General and Administrative Expense [Abstract]

Selling, General and Administrative Expenses

18. Selling, General and Administrative Expenses

Selling, general and administrative expenses consist of the following:

	Year Ended December 31,
	2016		2017		2018
Employee compensation		473,302		929,928		2,256,455
Marketing and promotional expenses		239,549		523,535		1,158,519
Professional services		133,368		238,740		578,469
Rental and related expenses		91,535		216,111		450,113
Depreciation and amortization expenses		38,268		128,918		249,765
Travel and entertainment expenses		32,572		71,278		197,187
IT consumable, office supply and other low value consumable		21,621		114,668		167,323
Others		106,972		127,529		283,959
Total		1,137,187		2,350,707		5,341,790

Acquisition and Investment in Equity Investees

12 Months Ended

Dec. 31, 2018

Business Combinations [Abstract]

Acquisition and Investment in Equity Investees

19. Acquisition and Investment in Equity Investees

On June 1, 2017, the Company entered into an agreement with the minority shareholder of NIO Sport for the purchase of the remaining 45% shares of NIO Sport at total consideration of US$4,000 and GBP200 (RMB28,417 equivalent in total). The Company recorded the difference between the carrying amount of the non-controlling interest and the consideration paid in accumulated deficit.

Convertible Promissory Note

12 Months Ended

Dec. 31, 2018

Convertible Promissory Note [Abstract]

Convertible Promissory Note

20. Convertible Promissory Note

On February 16, 2017, the Company issued convertible promissory note (“the Note”) in the aggregated principal amount of US$48,000 (RMB312,624 equivalent) to one of its existing convertible redeemable preferred shareholder with compounding interest at 15% per annum, maturing 90 days after the issuance date. Pursuant to the Note agreements, the holders of the Note may (i) convert the outstanding principal and accrued interest of the Note into the most recent round of equity security at a conversion price equal to 97% of the per share price paid by the investors in the event that the Company issues and sells equity security to investors on or before the date of the repayment in full of this Note in an equity financing resulting in gross proceeds to the Company of at least US$100,000 (“Qualified Financing”), however, the Company and the Note holder both agreed that the 3% discount on the price shall not be applicable to the Series C Convertible Redeemable Preferred Shares (“Series C Preferred Shares”), or (ii) convert the outstanding principal and accrued interest of the Note into Series B Convertible Redeemable Preferred Shares (“Series B Preferred Shares”) of the Company at a conversion price of US$2.751 per share if no Qualified Financing occurred before prior to the maturity date. The Company may elect to repay the accrued interests in cash under either way. The issuance cost for the Note was immaterial. On May 17, 2017, the Note was fully repaid in cash together with the accrued interest of US$1,800 (RMB12,389 equivalent).

Convertible Redeemable Preferred Shares

12 Months Ended

Dec. 31, 2018

Convertible Redeemable Preferred Shares [Abstract]

Convertible Redeemable Preferred Shares

21. Convertible Redeemable Preferred Shares

In March 2015, the Company issued 165,000,000 shares of Series A-1 convertible redeemable preferred shares (“Series A-1 Preferred Shares”) for US$1.00 per share for cash of US$165,000. The total consideration was paid in three instalments and were fully paid in January 2017. In March and May 2015, the Company issued 130,000,000 shares of Series A-2 convertible redeemable preferred shares (“Series A-2 Preferred Shares”) for US$1.00 per share for cash of US$130,000. In September 2015, the Company issued 24,210,431 shares of Series A-3 Preferred Shares for US$1.6522 per share for cash of US$40,000. The Series A-1, A-2 and A-3 Preferred Shares are collectively referred to as the “Series A Preferred Shares”.

In June, July, August, September 2016 and February 2017, the Company issued 114,867,321 shares of Series B convertible redeemable preferred shares (“Series B Preferred Shares”) for US$2.751 per share for cash of US$316,000.

In March, April, May and July 2017, the Company issued 166,205,830 shares of Series C convertible redeemable preferred shares (“Series C Preferred Shares”) for US$3.885 per share for cash of US$645,709.

In November and December 2017, the Company issued 211,156,415 shares of Series D convertible redeemable preferred shares (“Series D Preferred Shares”) for US$5.353 per share for cash of US$1,130,320. US$12,000 out of the total consideration from one of the investor was not paid until March 28, 2018 and it was treated as a reduction of Series D Preferred Shares until it was paid. In addition, a finder’s commission of US$26,000 was incurred for the Series D Preferred Shares financing. The Company paid 50% of the commission in cash amounted US$13,000 and the remaining 50% by issuance of 2,428,588 shares of Series D Preferred Shares for free to the financial advisory. The total of the finder’s commission was also recorded as an issuance cost as a deduction of the preferred shares.

The Series A-1, A-2, A-3, B, C and D Preferred Shares are collectively referred to as the “Preferred Shares”. All series of Preferred Shares have the same par value of US$0.00025 per share.

The Company classified the Preferred Shares in the mezzanine section of the consolidated balance sheets because they were redeemable at the holders’ option any time after a certain date and were contingently redeemable upon the occurrence of certain liquidation events outside of the Company’s control, that being the Company’s failure to complete a QIPO by December 31, 2021. The Preferred Shares are recorded initially at fair value, net of issuance costs. The issuance costs for Series A-1, A-2, A-3, B, C, and D were RMB1,892, RMB1,177, RMB1,296, RMB11,857, RMB10,039 and RMB6,033 (US$301, US$189, US$208, US$1,782, US$1,489 and US$901, equivalent).

The major rights, preferences and privileges of the Preferred Shares are as follows:

Voting Rights

The holders of the Preferred Shares shall have the right to one vote for each ordinary share into which each outstanding Preferred Share held could then be converted. The holders of the Preferred Shares vote together with the Ordinary Shareholders, and not as a separate class or series, on all matters put before the shareholders. The holders of the Preferred Shares are entitled to appoint a total of 10 out of 11 directors of the Board.

Dividends

Subject to the approval and declaration by the Board of Directors, the holders of the Preferred Shares (exclusive of unpaid shares) are entitled to receive dividends in the following order:

Series D Preferred Shareholders are entitled to receive dividends at an amount equal to 5% of the issue price prior to and in preference to any dividend on the Series C preferred Shares, Series B preferred shares, Series A Preferred Shares and ordinary shares;

Series C Preferred Shareholders are entitled to receive dividends at an amount equal to 5% of the issue price prior to and in preference to any dividend on the Series B preferred shares, Series A Preferred Shares and ordinary shares;

Series B Preferred Shareholders are entitled to receive dividends at an amount equal to 5% of the issue price prior to and in preference to any dividend on the Series A Preferred Shares and ordinary shares;

Series A Preferred Shareholders are entitled to receive dividends at an amount equal to 5% of the issue price prior to and in preference to any ordinary shares;

any remaining dividends shall be distributed on a pro rata basis to holders of all the Preferred Shares and ordinary shares on a fully diluted and as-if converted basis.

No dividends on preferred and ordinary shares have been declared since the issuance date through December 31, 2017 and 2018.

Liquidation

In the event of any liquidation, the holders of Preferred Shares have preference over holders of ordinary shares with respect to payment of dividends and distribution of assets. Upon Liquidation, Series D Preferred Shares shall rank senior to Series C Preferred Shares, Series C Preferred Shares shall rank senior to Series B Preferred Shares, Series B Preferred Shares shall rank senior to Series A-3 Preferred Shares, Series A-3 Preferred Shares shall rank senior to Series A-1 and A-2 Preferred Shares, Series A-1 and A-2 Preferred Shares shall rank senior to ordinary shares.

The holders of Preferred Shares (exclusive of unpaid shares) shall be entitled to receive an amount per share equal to (A) an amount equal to the higher of (1) 100% of the original issue price of such Preferred Shares, and (2) the amount that would be payable on such Preferred Shares if converted into ordinary shares immediately before such Liquidation; and (B) the amount of all declared but unpaid dividends on such Preferred Shares based on such holder’s pro rata portion of the total number of the Preferred Shares. If there are still assets of the Company legally available for distribution, such remaining assets of the Company shall be distributed to the holders of issued and outstanding Ordinary Shares on pro rata basis among themselves.

Conversion

The Preferred Shares (exclusive of unpaid shares) would automatically be converted into common shares 1) upon a QIPO; or 2) upon the written consent of the holders of a majority of the outstanding Preferred Share of each class with respect to conversion of each class.

The initial conversion ratio of Preferred Shares to ordinary shares shall be 1:1, subject to adjustments in the event of (i) share splits, share dividends, combinations, recapitalization and similar events, or (ii) issuance of Ordinary Shares (excluding certain events such as issuance of ordinary shares pursuant to a public offering) at a price per share less than the conversion price in effect on the date of or immediately prior to such issuance.

The Company determined that there were no beneficial conversion features identified for any of the Preferred Shares during any of the periods. In making this determination, the Company compared the fair value of the ordinary shares into which the Preferred Shares are convertible with the respective effective conversion price at the issuance date. In all instances, the effective conversion price was greater than the fair value of the ordinary shares. To the extent a conversion price adjustment occurs, as described above, the Company will re-evaluate whether or not a beneficial conversion feature should be recognized.

Redemption

The Company shall redeem, at the option of any holder of outstanding Preferred Shares, all of the outstanding Preferred Shares (other than the unpaid shares) held by the requesting holder, at any time after the earliest to occur of (a) December 31, 2021, if no QIPO or Approved Sale has been consummated prior to such date, (b) any material change in applicable law that would prohibit or otherwise make it illegal to continue to operate the business under the then-existing equity structure of the Group, which could not be solved by alteration or adjustment of the equity structure of the Group after good faith consultation among the Company and its shareholders, (c) the early termination of employment or service contracts of no less than 30% of the certain key employees (or subsequent persons holding their respective positions) with the Group during any six-month period (excluding any early termination with cause) which has resulted in material adverse effect with respect to the Business of the Group as a whole, and (d) termination or disruption of the business of the Group as a whole, which is attributable to any Group Company’s non-compliance with applicable laws or breach or early termination of material business contracts or business arrangements with any supplier, clients or otherwise (any matter or event as described in items (a) to (d), hereinafter a “Redemption Event”), or (e) any other Preferred Share holder has requested the Company to redeem its shares in any Redemption Event by delivery of a notice.

The redemption amount payable for each Preferred Share (other than the unpaid shares) will be an amount equal to the greater of (a) 100% of the Preferred Shares’ original issue price, plus all accrued but unpaid dividends thereon up to the date of redemption and compound interest on the preferred shares’ original issue price at the rate of 8% per annum, proportionally adjusted for share subdivisions, share dividends, reorganizations, reclassifications, consolidations, mergers or similar transactions, and (b) the fair market value of such Preferred Shares at the date of redemption.

Upon the redemption, Series D Preferred Shares shall rank senior to Series C Preferred Shares, Series C Preferred Shares shall rank senior to Series B Preferred Shares, Series B Preferred Shares shall rank senior to Series A-3 Preferred Shares, Series A-3 Preferred Shares shall rank senior to Series A-1 and A-2 Preferred Shares, Series A-1 and A-2 Preferred Shares shall rank pari passu to each other.

Conversion upon IPO

On September 14, 2018, in connection with the completion of IPO, all of the Preferred Shares were automatically converted to 821,378,518 ordinary shares based on the aforementioned conversion price.

Accounting for Preferred Shares

The Company recognized accretion to the respective redemption value of the Preferred Shares over the period starting from issuance date to September 12, 2018, the earliest redemption date. According to the redemption price calculation described above, the Company recognized accretion of the Preferred Shares amounted to RMB981,233, RMB2,576,935 and RMB13,667,291 for the years ended December 31, 2016, 2017 and 2018.

The Company's convertible redeemable preferred shares activities for the years ended December 31, 2016, 2017 and 2018 are summarized below.:

	Series A-1 & A-2				Series A-3				Series B				Series C				Series D				Total
	Number of shares		Amount (RMB)		Number of shares		Amount (RMB)		Number of shares		Amount (RMB)		Number of shares		Amount (RMB)		Number of shares		Amount (RMB)		Number of shares		Amount (RMB)
Balances as of January 1, 2016		295,000,000		1,340,034		24,210,431		276,695		—		—		—		—		—		—		319,210,431		1,616,729
Proceeds from Series A-1 Preferred Shares		—		401,478		—		—		—		—		—		—		—		—		—		401,478
Issuance of preferred shares		—		—		—		—		102,144,675		1,862,134		—		—		—		—		102,144,675		1,862,134
Accretion on convertible redeemable preferred shares to redemption value		—		798,481		—		29,983		—		152,769		—		—		—		—		—		981,233
Balances as of December 31, 2016		295,000,000		2,539,993		24,210,431		306,678		102,144,675		2,014,903		—		—		—		—		421,355,106		4,861,574
Proceeds from Series A-1 Preferred Shares		—		266,511		—		—		—		—		—		—		—		—		—		266,511
Issuance of preferred shares		—		—		—		—		12,722,646		240,066		166,205,830		4,398,313		213,585,003		7,314,387		392,513,479		11,952,766
Accretion on convertible redeemable preferred shares to redemption value		—		2,205,227		—		120,451		—		40,011		—		56,283		—		154,963		—		2,576,935
Balances as of December 31, 2017		295,000,000		5,011,731		24,210,431		427,129		114,867,321		2,294,980		166,205,830		4,454,596		213,585,003		7,469,350		813,868,585		19,657,786

	Series A-1 & A-2						Series A-3						Series B						Series C						Series D						Total
	Number of shares			Amount (RMB)			Number of shares			Amount (RMB)			Number of shares			Amount (RMB)			Number of shares			Amount (RMB)			Number of shares			Amount (RMB)			Number of shares			Amount (RMB)
Balances as of December 31, 2017		295,000,000			5,011,731			24,210,431			427,129			114,867,321			2,294,980			166,205,830			4,454,596			213,585,003			7,469,350			813,868,585			19,657,786
Issuance of Series A-3 Preferred Shares (note 24(c))		—			—			7,509,933			—			—			—			—			—			—			—			7,509,933			—
Proceeds from Series D Preferred Shares		—			—			—			—			—			—			—			—			—			78,651			—			78,651
Accretion on convertible redeemable preferred shares to redemption value		—			7,091,163			—			565,979			—			2,417,979			—			2,375,943			—			1,216,227			—			13,667,291
Conversion of Series A-1 and A-2 Preferred Shares to Ordinary shares		(295,000,000	)		(12,102,894	)		—			—			—			—			—			—			—			—			(295,000,000	)		(12,102,894	)
Conversion of Series A-3 Preferred Shares to Ordinary shares		—			—			(31,720,364	)		(993,108	)		—			—			—			—			—			—			(31,720,364	)		(993,108	)
Conversion of Series B Preferred Shares to Ordinary shares		—			—			—			—			(114,867,321	)		(4,712,959	)		—			—			—			—			(114,867,321	)		(4,712,959	)
Conversion of Series C Preferred Shares to Ordinary shares		—			—			—			—			—			—			(166,205,830	)		(6,830,539	)		—			—			(166,205,830	)		(6,830,539	)
Conversion of Series D Preferred Shares to Ordinary shares		—			—			—			—			—			—			—			—			(213,585,003	)		(8,764,228	)		(213,585,003	)		(8,764,228	)
Balances as of December 31, 2018		—			—			—			—			—			—			—			—			—			—			—			—

Redeemable non-controlling interests

12 Months Ended

Dec. 31, 2018

Redeemable Noncontrolling Interest, Equity, Carrying Amount [Abstract]

Redeemable non-controlling interests

22. Redeemable non-controlling interests

XPT (Jiangsu) Automotive Technology Co., Ltd. (“XPT Auto”), the Group’s wholly owned subsidiary had its redeemable preferred share (“XPT Auto PS”) financing of RMB1,269,900 to certain third party strategic investors in the second quarter of 2018. These third party strategic investors’ contributions in XPT Auto were accounted for as the Group’s redeemable non-controlling interests, and were classified as Mezzanine equity. Pursuant to XPT Auto’s share purchase agreement, the XPT Auto PS issued to third party strategic investors have the same rights as the existing ordinary shareholder of XPT Auto except that they have following privileges:

Redemption

The holders of XPT Auto PS have the option to request XPT Auto to redeem those shares under certain circumstance: (1) a qualified initial public offering of XPT Auto has not occurred by the fifth anniversary after the issuance of XPT Auto PS; (2) XPT Auto doesn’t meet its performance target (revenue and net profit) for each of the year during FY2019 and FY2023; or (3) a deadlock event lasts for 60 working days and cannot be resolved.

The redemption price should be equal to the original issue price plus simple interest on the original issue price at the rate of 10% per annum minus the dividends paid up to the date of redemption.

Liquidation

In the event of any liquidation, the holders of XPT Auto PS have preference over holders of ordinary shares. On a return of capital on liquidation, XPT Auto’s assets available for distribution among the investors shall first be paid to XPT Auto PS investors at the amount equal to the original issue price plus simple interest on the original issue price at the rate of 10% per annum minus the dividends paid up to the date of liquidation. The remaining assets of XPT Auto shall all be distributed to its ordinary shareholders.

The Company recognized accretion to the respective redemption value of the XPT Auto PS over the period starting from issuance date. As of December 31, 2018, RMB1,265,900 out of the total consideration was paid by those investors and the remaining RMB4,000 were still outstanding.

Ordinary Shares

12 Months Ended

Dec. 31, 2018

Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]

Ordinary Shares

23. Ordinary Shares

Upon inception, each ordinary share was issued at a par value of US$0.00025 per share. Various numbers of ordinary shares were issued to share-based compensation award recipients. As of December 31, 2017, the authorized share capital of the Company is US$500 divided into 2,000,000,000 shares, comprising of: 1,151,269,325 Ordinary Shares, 165,000,000 Series A-1 Preferred Shares, 130,000,000 Series A-2 Preferred Shares, 31,720,364 Series A-3 Preferred Shares, 114,867,321 Series B Preferred Shares, 167,142,990 Series C Preferred Shares, 240,000,000 Series D Preferred Shares, each at a par value of US$0.00025 per share. As of December 31, 2018, the authorized share capital of the Company is US$1,000 divided into 4,000,000,000 shares, comprising of: 2,500,000,000 Class A Ordinary Shares, 132,030,222 Class B Ordinary Shares, 148,500,000 Class C Ordinary Shares, each at a par value of US$0.00025 per share, and 1,219,469,778 shares of a par value of US$0.00025 each of such class or classes as the board of directors may determine.

As of December 31, 2017 and 2018, 1,151,269,325 and 4,000,000,000 ordinary shares were authorized, respectively, 36,727,350 and 1,057,731,012 shares were issued and 23,850,343 and 1,050,799,032 shares were outstanding as of December 31, 2017 and 2018, respectively.

Share-based Compensation

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-based Compensation

24. Share-based Compensation

Compensation expenses recognized for share-based awards granted by the Company were as follows:

	For the Year Ended December 31,
	2016		2017		2018
Cost of sales		—		—		9,289
Research and development expenses		14,484		23,210		109,124
Selling, general and administrative expenses		62,200		67,086		561,055
Total		76,684		90,296		679,468

There was no income tax benefit recognized in the consolidated statements of comprehensive loss for share-based compensation expenses and the Group did not capitalize any of the share-based compensation expenses as part of the cost of any assets in the years ended December 31, 2016, 2017 and 2018.

(a) Prime Hubs’ Restricted Shares Plan

In 2015, the Company adopted the Prime Hubs Restricted Shares Plan (the “Prime Hubs Plan”). Pursuant to the Prime Hubs Plan, restricted shares were granted to certain employees and non-employee consultants of the Group as approved by the board of directors. The restricted shares granted require the non-employee consultants to serve the Group for a period of one year with 100% of the restricted shares vesting upon the completion of the service period and the employees to serve the group for a period of four years with 25% of the restricted shares vesting at each anniversary of the service commencement date. The restricted shares issued under the Prime Hubs Plan are held by Prime Hubs, a consolidated variable interest entity of the Company, and are accounted for as treasury stocks of the Company prior to their vesting.

The following table summarizes activities of the Company’s restricted shares granted to employees under the Prime Hubs Plan:

(i) Employees

Employees	Number of Shares Outstanding			Weighted Average Grant Date Fair Value
				US$
Unvested as of December 31, 2015		13,450,000			0.72
Vested		(3,362,500	)		0.72
Forfeited		(1,687,500	)		0.72
Unvested as of December 31, 2016		8,400,000			0.72
Granted		2,000,000			2.05
Vested		(3,133,329	)		0.84
Forfeited		(208,333	)		0.72
Unvested as of December 31, 2017		7,058,338			1.04
Vested		(7,058,338	)		1.04
Unvested as of December 31, 2018		—			—

In August 2018, the Company agreed to repurchase 562,500 vested Prime Hubs restricted shares from a former employee who passed away with total cash consideration of RMB7,490 at the fair value.

For the years ended December 31, 2016, 2017 and 2018, total share-based compensation expenses recognized for the employee restricted shares granted under the Prime Hubs Plan were RMB8,435, RMB20,572 and RMB39,560, respectively.

As of December 31, 2017 and 2018, there were RMB37,651 and nil of unrecognized share-based compensation expenses related to the employee restricted shares granted under the Prime Hubs Plan. Such unrecognized expenses are expected to be recognized over a weighted-average period of 1.69 and zero years, respectively, as of December 31, 2017 and 2018.

(ii) Non-Employees

Non-Employees	Number of Shares Outstanding			Weighted Average Grant Date Fair Value
				US$
Unvested as of December 31, 2015		2,950,000			1.25
Vested		(2,950,000	)		1.25
Unvested as of December 31, 2016, 2017 and 2018		—			—

In January 2017, the Company agreed to repurchase 250,000 vested Prime Hubs restricted shares from a non-employee with total cash consideration of RMB1,686.

For the years ended December 31, 2016, 2017 and 2018, total share-based compensation expenses recognized for the non-employee restricted shares granted the Prime Hubs Plan were RMB24,532, nil and nil, respectively.

As of December 31, 2016, all share-based compensation expenses related to the non-employee restricted shares granted the Prime Hubs Plan had been recognized.

(b) NIO Incentive Plans

In 2015, the Company adopted the 2015 Stock Incentive Plan (the “2015 Plan”), which allows the plan administrator to grant options and restricted shares of the Company to its employees, directors, and consultants.

The Company granted both share options and restricted shares to the employees. The share options and restricted shares of the Company under 2015 Plan have a contractual term of ten years from the grant date, and vest over a period of four years of continuous service, one fourth (1/4) of which vest upon the first anniversary of the stated vesting commencement date and the remaining vest rateably over the following 36 months. Under the 2015 plan, share options granted to the non-NIO US employees of the Group are only exercisable upon the occurrence of an initial public offering by the Company.

In 2016 and 2017, the Board of Directors further approved the 2016 Stock Incentive Plan (the “2016 Plan”) and the 2017 Stock Incentive Plan (the “2017 Plan”). The share options of the Company under 2016 and 2017 Plan have a contractual term of seven or ten years from the grant date, and vest immediately or over a period of four or five years of continuous service.

As of December 31, 2017, the Group had not recognized any share-based compensation expenses for options granted to the non-NIO US employees of the Group, because the Company is unable to determine if it is probable that the performance conditions will be satisfied until the event occurs. As a result, the share-based compensation expenses for these options that are only exercisable upon the occurrence of the Company’s initial public offering will be recognized using the graded-vesting method upon the consummation of the initial public offering. The Group recognized the share options and restricted shares of the Company granted to the employees of NIO US on a straight-line basis over the vesting term of the awards, net of estimated forfeitures.

Upon completion of the Company’s IPO on September 12, 2018, share-based compensation expenses for options granted to the non-NIO US employees of the Group were recognized by using the graded-vesting method.

(i) Share Options

The following table summarizes activities of the Company’s share options under the 2015, 2016 and 2017 Plans for the years ended December 31, 2016, 2017 and 2018:

	Number of Options Outstanding			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life		Aggregate Intrinsic Value
				US$		In Years		US$
Outstanding as of December 31, 2015		—			—		—		—
Granted		53,576,606			0.32		—		—
Cancelled		(945,346	)		0.39		—		—
Expired		(7,706	)		0.10		—		—
Outstanding as of December 31, 2016		52,623,554			0.32		8.30		51,506
Granted		13,460,477			1.46		—		—
Exercised		(2,723,540	)		0.39		—		—
Cancelled		(5,236,562	)		0.44		—		—
Expired		(348,015	)		0.25		—		—
Outstanding as of December 31, 2017		57,775,914			0.57		8.52		114,299
Granted		47,216,792			2.79		—		—
Exercised		(7,732,317	)		0.40		—		—
Cancelled		(5,498,453	)		1.17		—		—
Expired		(687,796	)		0.62		—		—
Outstanding as of December 31, 2018		91,074,140			1.69		8.23		425,988
Vested and expected to vest as of December 31, 2016		50,782,627			—		—		49,245
Exercisable as of December 31, 2016		1,297,535			—		—		1,336
Vested and expected to vest as of December 31, 2017		55,832,678			—		—		107,299
Exercisable as of December 31, 2017		5,089,894			—		—		11,070
Vested and expected to vest as of December 31, 2018		99,702,386			—		—		467,127
Exercisable as of December 31, 2018		32,959,964			—		—		185,787

The weighted-average grant date fair value for options granted under the Company’s 2015, 2016 and 2017 Plans during the years ended December 31, 2016, 2017 and 2018 was US$0.90, US$1.21 and US$1.93, respectively, computed using the binomial option pricing model.

The total share-based compensation expenses recognized for share options during the years ended December 31, 2016, 2017 and 2018 was RMB17,998, RMB30,127 and RMB437,320 respectively.

The fair value of each option granted under the Company’s 2015, 2016 and 2017 Plans during 2016, 2017 and 2018 was estimated on the date of each grant using the binomial option pricing model with the assumptions (or ranges thereof) in the following table:

	2016			2017			2018
Exercise price (US$)		0.10-0.61			0.61-2.55			0.10 - 6.74
Fair value of the ordinary shares on the date of option grant (US$)		0.96-1.30			1.30-2.55			3.38 - 6.74
Risk-free interest rate		1.46%-1.78	%		2.31%-2.40	%		2.74% - 3.15	%
Expected term (in years)		10			10			7 - 10
Expected dividend yield		0	%		0	%		0	%
Expected volatility		54	%		51%-52	%		47% - 51	%
Expected forfeiture rate (post-vesting)		5	%		5	%		5% - 8	%

Risk-free interest rate is estimated based on the yield curve of US Sovereign Bond as of the option valuation date. The expected volatility at the grant date and each option valuation date is estimated based on annualized standard deviation of daily stock price return of comparable companies with a time horizon close to the expected expiry of the term of the options. The Company has never declared or paid any cash dividends on its capital stock, and the Group does not anticipate any dividend payments in the foreseeable future. Expected term is the contract life of the options.

As of December 31, 2017 and 2018, there were RMB58,444 and RMB17,101 of unrecognized compensation expenses related to the stock options granted to the employees of NIO US, which is expected to be recognized over a weighted-average period of 2.53 and 2.67 years, respectively.

As of December 31, 2017, there were RMB275,473 of unrecognized compensation expenses related to the stocks options granted to the Group’s non-NIO US employees with a performance condition of an IPO, out of which, unrecognized compensation expenses of RMB138,884 related to options for which the service condition had been met and are expected to be recognized when the performance target of an IPO is achieved.

As of December 31, 2018, there were RMB50,279 of unrecognized compensation expenses related to the stocks options granted to the Group’s non-NIO US employees which is expected to be recognized over a weighted-average period of 3.02 years.

(ii) Restricted shares

The fair value of each restricted share granted with service conditions is estimated based on the fair market value of the underlying ordinary shares of the Company on the date of grant.

The following table summarizes activities of the Company’s restricted shares to US employees under the 2015 plan:

	Number of Restricted Shares Outstanding			Weighted Average Grant Date Fair Value
				US$
Unvested at December 31, 2015		—			—
Granted		3,103,809			0.96
Vested		(960,958	)		0.96
Forfeited		(305,464	)		0.96
Unvested at December 31, 2016		1,837,387			0.96
Vested		(470,015	)		0.96
Forfeited		(254,395	)		0.96
Unvested at December 31, 2017		1,112,977			0.96
Vested		(608,406	)		0.96
Forfeited		(63,058	)		0.96
Unvested at December 31, 2018		441,513			0.96

As of December 31, 2017 and 2018, there were RMB6,095 and RMB2,812 of unrecognized compensation expenses related to restricted shares granted to the employees of NIO US, which is expected to be recognized over a weighted-average period of 1.75 and 0.75 years, respectively.

Share-based compensation expenses of RMB6,137, RMB4,151 and RMB3,790 related to restricted shares granted to the employees of NIO US was recognized for the years ended December 31, 2016, 2017 and 2018, respectively.

The following table summarizes activities of the Company’s restricted shares to non-US employees under the 2016 and 2017 plan:

	Number of Restricted Shares Outstanding			Weighted Average Grant Date Fair Value
				US$
Unvested at December 31, 2017		—			—
Granted		509,001			6.72
Vested		(445,104	)		6.74
Unvested at December 31, 2018		63,897			6.60

As of December 31, 2018, there were RMB2,798 of unrecognized compensation expenses related to restricted shares granted to the non-US employees, which is expected to be recognized over a weighted-average period of 1.70 years.

Share-based compensation expenses of nil, nil and RMB20,323 related to restricted shares granted to the non-US employees was recognized for the years ended December 31, 2016, 2017 and 2018.

(c) Non-recourse Loan

In November 2015, the Company issued an offer letter to one of its key management team member (“the Borrower”). In the offer letter, the Company offered the Borrower to purchase 7,509,933 Series A-3 Preferred Shares of the Company at the price of US$1.6522 per share, which equals to the purchase price same class of preferred shares by other third party investors in the most recent round of financing prior to the offer letter. In addition, the Company agreed to provide a loan in the amount of US$12,408 with an interest rate of 1.8% compounded semiannually to paid for the fund the purchase of such Series A-3 Preferred Shares by the Borrower (“the Loan”). The Loan agreement was signed on March 10, 2016. The Loan is subject to a three-year service condition with 25% immediately vested on the grant date and 25% cliff vesting annually. The Borrower’s personal liability on the Loan, and the Company’s recourse against the Borrower personally on the Loan, shall be limited to 50% of the then-outstanding principal amount of the Loan, including any interest accrued thereon.

In June 2018, the Borrower repaid the loan pursuant to the agreement, including the interest accrued, to the Company, amounting to RMB82,863. By the time of the repayment, 75% of the Award was vested and considered as exercised while 25% remained as unvested.

Pursuant to ASC 718, the Company accounted for the Loan as a stock liability (the “Award”). Given the underlying of the Award is Series A-3 Preferred Shares, it was treated as a liability award following ASC 480. The Award was initially recognized at fair value and subsequently re-measured by recognizing the change in fair value as an adjustment to the compensation costs. The fair value of the Award granted was estimated on each reporting date using the Black-Scholes option pricing model with the assumptions (or ranges thereof) in the following table:

	2016			2017			2018
Exercise price		1.83			1.82			1.74
Fair value of the Preferred Shares on the measurement date		1.80			2.70			4.54
Risk-free interest rate		2	%		2	%		2	%
Remaining life (in years)		4.75			3.64			0.26
Expected dividend yield		0	%		0	%		0	%
Expected volatility		47-51	%		47-48	%		43%-44	%

As of December 31, 2018, the Award was fully vested and exercised. Unrecognized expense related to the Award was nil.

Share-based compensation expenses related to the Award of RMB19,582, RMB35,446 and RMB178,475 was recognized for the years ended December 31, 2016, 2017 and 2018, respectively.

Taxation

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Taxation

25. Taxation

(a) Income taxes

Cayman Islands

The Company was incorporated in the Cayman Islands and conducts most of its business through its subsidiaries located in Mainland China, Hong Kong, United States, United Kingdom and Germany. Under the current laws of the Cayman Islands, the Company is not subject to tax on either income or capital gain. Additionally, upon payments of dividends to the shareholders, no Cayman Islands withholding tax will be imposed.

PRC

All Chinese companies are subject to enterprise income tax (“EIT”) at a uniform rate of 25%.

Under the EIT Law enacted by the National People’s Congress of PRC on March 16, 2007 and its implementation rules which became effective on January 1, 2008, dividends generated after January 1, 2008 and payable by a foreign investment enterprise in the PRC to its foreign investors who are non-resident enterprises are subject to a 10% withholding tax, unless any such foreign investor’s jurisdiction of incorporation has a tax treaty with the PRC that provides for a different withholding arrangement. Under the taxation arrangement between the PRC and Hong Kong, a qualified Hong Kong tax resident which is the “beneficial owner” and directly holds 25% or more of the equity interest in a PRC resident enterprise is entitled to a reduced withholding tax rate of 5%. The Cayman Islands, where the Company was incorporated, does not have a tax treaty with PRC.

The EIT Law also provides that an enterprise established under the laws of a foreign country or region but whose “de facto management body” is located in the PRC be treated as a resident enterprise for PRC tax purposes and consequently be subject to the PRC income tax at the rate of 25% for its global income. The Implementing Rules of the EIT Law merely define the location of the “de facto management body” as “the place where the exercising, in substance, of the overall management and control of the production and business operation, personnel, accounting, properties, etc., of a non-PRC company is located.” Based on a review of surrounding facts and circumstances, the Group does not believe that it is likely that its operations outside of the PRC will be considered a resident enterprise for PRC tax purposes. However, due to limited guidance and implementation history of the EIT Law, there is uncertainty as to the application of the EIT Law. Should the Company be treated as a resident enterprise for PRC tax purposes, the Company will be subject to PRC income tax on worldwide income at a uniform tax rate of 25%.

According to relevant laws and regulations promulgated by the State Administration of Tax of the PRC effective from 2008 onwards, enterprises engaging in research and development activities are entitled to claim 175% of their qualified research and development expenses so incurred as tax deductible expenses when determining their assessable profits for the year (‘Super Deduction’). The additional deduction of 75% of qualified research and development expenses can only be claimed directly in the annual EIT filing and subject to the approval from the relevant tax authorities.

Hong Kong

Under the current Hong Kong Inland Revenue Ordinance, the subsidiaries of the Group incorporated in Hong Kong are subject to 16.5% Hong Kong profit tax on their taxable income generated from operations in Hong Kong. Additionally, payments of dividends by the subsidiaries incorporated in Hong Kong to the Company are not subject to any Hong Kong withholding tax.

Other Countries

The maximum applicable income tax rates of other countries where the Company’s subsidiaries having significant operations for the years ended December 31, 2016, 2017 and 2018 are as follows:

	For the Year Ended December 31,
	2016			2017			2018
United States		42.84	%		42.84	%		29.84	%
United Kingdom		20.00	%		19.25	%		19.00	%
Germany		32.98	%		32.98	%		32.98	%

Composition of income tax expense for the periods presented are as follows:

	For the Year Ended December 31,
	2016		2017		2018
Current income tax expense		4,314		7,906		22,044

Reconciliations of the income tax expense computed by applying the PRC statutory income tax rate of 25% to the Group’s income tax expense of the years presented are as follows:

	For the Year Ended December 31,
	2016			2017			2018
Loss before income tax expense		(2,568,940	)		(5,013,268	)		(9,616,935	)
Income tax expense computed at PRC statutory income tax rate of 25%		(642,235	)		(1,253,318	)		(2,404,234	)
Non-deductible expenses		91,915			91,093			96,684
Foreign tax rates differential		52,495			(74,531	)		167,180
Additional 50% tax deduction for qualified research and development expenses		(46,527	)		(93,513	)		(216,993	)
Tax exempted interest income		(52	)		(845	)		(10,377	)
Effect of U.S. tax law change		—			165,898			—
US tax credits		(5,716	)		(52,185	)		(42,781	)
Prior year adjustments		3,594			(10,293	)		(1,422	)
Tax benefit not utilized		550,840			1,235,600			2,433,987
Income tax expense		4,314			7,906			22,044

The PRC statutory income tax rate was used because the majority of the Group’s operations are based in PRC.

(b) Deferred tax

The Group considers positive and negative evidence to determine whether some portion or all of the deferred tax assets will be more-likely-than-not realized. This assessment considers, among other matters, the nature, frequency and severity of recent losses and forecasts of future profitability. These assumptions require significant judgment and the forecasts of future taxable income are consistent with the plans and estimates the Group is using to manage the underlying business. The statutory income tax rate of 25% or applicable preferential income tax rates were applied when calculating deferred tax assets.

The Group’s deferred tax assets consist of the following components:

	As of December 31,
	2016			2017			2018
Deferred tax assets
Net operating loss carry-forwards		567,844			1,620,535			3,777,696
Accrued and prepaid expenses		39,174			84,320			255,240
Advertising expenses in excess of deduction limit		9,118			65,737			14,234
Tax credit carry-forwards		13,735			60,624			117,801
Property, plant and equipment, net		28,849			27,463			17,467
Deferred rent		9,478			8,699			36,729
Deferred Revenue		2,411			—			83,877
Unrealized financing cost		—			—			41,939
Intangible assets		1,643			7,104			15,687
Share-based compensation		637			4,106			8,962
Unrealized foreign exchange loss		—			55			55
Total deferred tax assets		672,889			1,878,643			4,369,687
Less: Valuation allowance		(672,889	)		(1,878,643	)		(4,369,687	)
Total deferred tax assets, net		—			—			—

Full valuation allowances have been provided where, based on all available evidence, management determined that deferred tax assets are not more likely than not to be realizable in future tax years. Movement of valuation allowance is as follow:

	As of December 31,
	2016		2017		2018
Valuation allowance
Balance at beginning of the year		—		672,889		1,878,643
Additions		672,889		1,205,754		2,491,044
Balance at end of the year		672,889		1,878,643		4,369,687

The Group has tax losses arising in Mainland China of 11,551,510 that will expire in one to five years for deduction against future taxable profit.

Loss expiring in 2019			4
Loss expiring in 2020			186,827
Loss expiring in 2021			1,335,168
Loss expiring in 2022			3,098,425
Loss expiring in 2023			6,931,086
Total			11,551,510

The Group has tax losses arising in Hong Kong and United Kingdom of 1,221,492 for which could be carried forward indefinitely against future taxable income.

The Group has tax losses arising in United States of 22,960, 232,429, 894,771 and 1,156,230 that will expire in seventeen, eighteen, nineteen and infinite years for deduction against future taxable income.

On December 22, 2017, the 2017 Tax Cuts and Jobs Act (“Tax Act”) was enacted into law making significant changes to the Internal Revenue Code. Changes include, but are not limited to, a federal corporate tax rate decrease from 35% to 21% for tax years beginning after December 31, 2017. The Group is required to recognize the effect of the tax law changes in the period of enactment, such as re-measuring the Group’s U.S. deferred tax assets and liabilities as well as reassessing the net realizability of the deferred tax assets and liabilities. The Tax Act did not give rise to any material impact on the consolidated balance sheets and consolidated statements of comprehensive loss due to the Group’s historical worldwide loss position and the full valuation allowance provided against the Group’s net U.S. deferred tax assets.

In December 2017, the Securities and Exchange Commission issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (“SAB 118”), which allows the Group to record provisional amounts during a measurement period not to extend beyond one year from the enactment date. Since the Tax Act was enacted late in the fourth quarter of 2017 (and ongoing guidance and accounting interpretations are expected over the next 12 months), the Group considers the accounting of deferred tax re-measurements and other items to be incomplete due to the forthcoming guidance and its ongoing analysis of final year-end data and tax positions. The Group expects to complete the analysis within the measurement period in accordance with SAB 118. The Group does not expect any subsequent adjustments to have any material impact on the consolidated balance sheets or consolidated statements of comprehensive loss due to our historical worldwide loss position and the full valuation allowance provided against the Group’s net U.S. deferred tax assets.

Uncertain Tax Position

The Group did not identify any significant unrecognized tax benefits for each of the periods presented. The Group did not incur any interest related to unrecognized tax benefits, did not recognize any penalties as income tax expense and also does not anticipate any significant change in unrecognized tax benefits within 12 months from December 31, 2018.

Loss Per Share

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Loss Per Share

26. Loss Per Share

Basic loss per share and diluted loss per share have been calculated in accordance with ASC 260 on computation of earnings per share for the years ended December 31, 2016, 2017 and 2018 as follows:

	For the Year Ended December 31,
	2016			2017			2018
Numerator:
Net loss		(2,573,254	)		(5,021,174	)		(9,638,979	)
Accretion on convertible redeemable preferred shares to redemption value		(981,233	)		(2,576,935	)		(13,667,291	)
Accretion on redeemable non-controlling interests to redemption value		—			—			(63,297	)
Net loss attributable to non-controlling interests		36,938			36,440			41,705
Net loss attributable to ordinary shareholders of NIO Inc. for basic/dilutive net loss per share		(3,517,549	)		(7,561,669	)		(23,327,862	)
Denominator:
Weighted-average number of ordinary shares outstanding — basic and diluted		16,697,527			21,801,525			332,153,211
Basic and diluted net loss per share attributable to ordinary shareholders of NIO Inc.		(210.66	)		(346.84	)		(70.23	)

For the years ended December 31, 2016, 2017 and 2018, assumed conversion of the Preferred Shares into ordinary shares were excluded from the calculations of diluted net loss per share of the Company due to the anti-dilutive effect. The effects of all outstanding share options have also been excluded from the computation of diluted net loss per share for the years ended December 31, 2016, 2017 and 2018, as their effects would be anti-dilutive.

For the years ended December 31, 2016, 2017 and 2018, the Company had potential ordinary shares, including non-vested restricted shares, option granted and Preferred Shares. As the Group incurred losses for the years ended December 31, 2016, 2017 and 2018, these potential ordinary shares were anti-dilutive and excluded from the calculation of diluted net loss per share of the Company. The weighted-average numbers of non-vested restricted shares, options granted and Preferred Shares excluded from the calculation of diluted net loss per share of the Company were 12,198,170, 26,311,777 and 369,222,548 as of December 31, 2016, 8,323,591, 27,495,737 and 593,611,970 as of December 31, 2017, 340,518, 72,735,288 and 678,614,152 as of December 31, 2018.

Related Party Balances and Transactions

12 Months Ended

Dec. 31, 2018

Related Party Balances and Transactions

27. Related Party Balances and Transactions

The principal related parties with which the Group had transactions during the years presented are as follows:

Name of Entity or Individual		Relationship with the Company
Bin Li		Principal Shareholder, Chairman of the Board and Chief Executive Officer
Lihong Qin		Principal Shareholder, Director and President of the Company
Baidu Capital L.P.		Shareholder
Hubei Changjiang Nextev New Energy Investment Management Co., Ltd.		Controlled by Principal Shareholder
Jiangsu Xindian Automotive Co., Ltd.		Controlled by Principal Shareholder
Beijing CHJ Information Technology Co., Ltd.		Controlled by Principal Shareholder
Ningbo Meishan Bonded Port Area Weilan Investment Co., Ltd.		Controlled by Principal Shareholder
Shanghai NIO Hongling Investment Management Co., Ltd.		Controlled by Principal Shareholder
NIO Capital		Controlled by Principal Shareholder
Hubei Changjiang Nextev New Energy Industry Development Capital Partnership (Limited Partnership)		Controlled by Principal Shareholder
Suzhou Zenlead XPT New Energy Technologies Co., Ltd.		Affiliate
Beijing Chehui Hudong Guanggao Co., Ltd.		Controlled by Principal Shareholder
Beijing Xinyi Hudong Guanggao Co., Ltd.		Controlled by Principal Shareholder
Bite Shijie (Beijing) Keji Co., Ltd.		Controlled by Principal Shareholder
Kunshan Siwopu Intelligent Equipment Co., Ltd.		Affiliate
Nanjing Weibang Transmission Technology Co., Ltd.		Affiliate
Shanghai Weishang Business Consulting Co.,Ltd.		Controlled by Principal Shareholder
Beijing Bitauto Information Technology Co., Ltd.		Controlled by Principal Shareholder

(a) The Group entered into the following significant related party transactions:

(i) Provision of service

For the years ended December 31, 2016, 2017 and 2018, service income was primarily generated from property management and miscellaneous research and development services the Group provided to its related parties.

	For the Year Ended December 31,
	2016		2017		2018
Shanghai NIO Hongling Investment Management Co., Ltd.		—		—		2,707
Shanghai Weishang Business Consulting Co.,Ltd.		—		—		905
Hubei Changjiang Nextev New Energy Investment Management Co.,Ltd.		—		11,121		—
Beijing CHJ Information Technology Co., Ltd.		—		4,588		—
Hubei Changjiang Nextev New Energy Industry Development Capital Partnership (Limited Partnership)		—		4,015		—
Jiangsu Xindian Automotive Co., Ltd.		—		1,785		—
		—		21,509		3,612

(ii) Acceptance of marketing and advertising service

	For the Year Ended December 31,
	2016		2017		2018
Beijing Xinyi Hudong Guanggao Co., Ltd.		—		8,021		28,245
Beijing Chehui Hudong Guanggao Co., Ltd.		—		544		6,915
Bite Shijie (Beijing) Keji Co., Ltd.		—		6,987		2,865
Beijing Bitauto Information Technology Co., Ltd.		—		—		32
		—		15,552		38,057

(iii) Loan to related party

	For the Year Ended December 31,
	2016		2017		2018
NIO Capital		—		—		66,166
Ningbo Meishan Bonded Port Area Weilan Investment Co., Ltd.		—		50,000		—
		—		50,000		66,166

In 2017, the Company granted interest-free loans to Ningbo Meishan Bonded Port Area Weilan Investment Co., Ltd. As of December 31, 2018, the loans remain outstanding.

On January 12, 2018, the Group granted two interest free loans to NIO Capital, with principal amount of US$5,000 each, The loans mature in six months. One of the loan can be converted into ordinary shares of a subsidiary of NIO Capital upon maturity at the option of the Group.

(iv) Cost of manufacturing consignment

	For the Year Ended December 31,
	2016		2017		2018
Suzhou Zenlead XPT New Energy Technologies Co.,Ltd.		—		18,324		132,152

(v) Purchase of property and equipment

	For the Year Ended December 31,
	2016		2017		2018
Kunshan Siwopu Intelligent Equipment Co., Ltd.		—		—		11,107
Bite Shijie (Beijing) Keji Co., Ltd.		—		2,960		—
		—		2,960		11,107

(vi) Interest payable on behalf of related party

	For the Year Ended December 31,
	2016		2017		2018
Baidu Capital L.P.		—		21,671		8,065

(vii) Acceptance of R&D and maintenance service

	For the Year Ended December 31,
	2016		2017		2018
Suzhou Zenlead XPT New Energy Technologies Co.,Ltd.		—		—		14,776
Kunshan Siwopu Intelligent Equipment Co., Ltd.		—		—		2,436
		—		—		17,212

(viii) Payment on behalf of related party

	For the Year Ended December 31,
	2016		2017		2018
Nanjing Weibang Transmission Technology Co., Ltd.		—		—		2,790

(b) The Group had the following significant related party balances:

(i) Amounts due from related parties

	December 31, 2017		December 31, 2018
Ningbo Meishan Bonded Port Area Weilan Investment Co., Ltd.		50,000		50,000
NIO Capital		—		34,316
Kunshan Siwopu Intelligent Equipment Co., Ltd.		—		7,970
Nanjing Weibang Transmission Technology Co., Ltd.		—		2,790
Shanghai Weilan Hongling Investment Management Co., Ltd.		—		960
Baidu Capital L.P.		21,671		—
Beijing CHJ Information Technology Co., Ltd.		3,624		—
Bin Li		1,680		—
Jiangsu Xindian Automotive Co., Ltd.		1,627		—
Hubei Changjiang Nextev New Energy Investment Management Co., Ltd.		954		—
Total		79,556		96,036

(ii) Amounts due to related parties

	December 31, 2017		December 31, 2018
Suzhou Zenlead XPT New Energy Technologies Co., Ltd.		19,466		210,868
Beijing Chehui Hudong Guanggao Co., Ltd.		576		4,085
Beijing Xinyi Hudong Guanggao Co., Ltd.		400		3,530
Kunshan Siwopu Intelligent Equipment Co., Ltd.		—		761
Bite Shijie (Beijing) Keji Co., Ltd. .		—		339
Bin Li		14,289		—
Lihong Qin		5,338		—
Total		40,069		219,583

Commitments and Contingencies

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

28. Commitments and Contingencies

(a) Capital commitments

Capital expenditures contracted for at the balance sheet dates but not recognized in the Group’s consolidated financial statements are as follows:

	December 31, 2017		December 31, 2018
Property and equipment		1,250,612		1,454,031
Leasehold improvements		470,600		149,551
Total		1,721,212		1,603,582

(b) Operating lease commitments

As of December 31, 2017 and 2018, the Group had remaining outstanding commitments non-cancelable agreements in respect to its operating leases as follows:

	December 31, 2017		December 31, 2018
Within one year		233,486		393,734
1 to 2 years		261,846		457,892
2 to 3 years		278,278		444,909
More than 3 years		912,356		1,091,911
Total		1,685,966		2,388,446

(c) Contingencies

On March 12, 2019, two putative securities class action lawsuits were filed against the Company and certain of the Company officers in the U.S. District Court of the Eastern District of New York. On March 14, 2019, another putative securities class action lawsuit was filed against the Company, certain of the Company directors and officers, and underwriters in the Supreme Court of the State of New York. The plaintiffs in these cases allege, in sum and substance, that the Company’s statements in the Registration Statement and/or other public statements were false or misleading and in violation of the U.S. federal securities laws. These actions remain in their preliminary stages and the Company is currently unable to determine the potential loss, if any, associated with the resolution of such lawsuits, if they proceed.

Subsequent Events

12 Months Ended

Dec. 31, 2018

Subsequent Events [Abstract]

Subsequent Events

29. Subsequent Events

On February 4, 2019, the Company issued US$650,000 aggregate principal amount of 4.50% Convertible Senior Notes due 2024 (the “2024 Notes”). The initial purchasers of the 2024 Notes were granted an option to purchase, exercisable within a 30-day period, up to an additional US$100 million principal amount of the 2024 Notes. The initial purchasers of the 2024 Notes have exercised the option in full by purchasing US$51,773 aggregate principal amount of the 2024 Notes on February 15, 2019 and US$48,227 aggregate principal amount of the 2024 Notes on February 28, 2019.

On January 30, 2019, in connection with the pricing of the 2024 Notes, the Company entered into capped call transactions. On February 15, 2019 and February 26, 2019, the Company entered into additional capped call transactions. The Company used a portion of the net proceeds of the 2024 Notes to pay the cost of such transactions. The cap price of these capped call transactions is initially US$14.92 per ADS and is subject to adjustment under the terms of the capped call transactions.

On January 30, 2019, in connection with the pricing of the 2024 Notes, the Company also entered into privately negotiated zero-strike call option transactions and used a portion of the net proceeds of the 2024 Notes to pay the aggregate premium under such transactions. Pursuant to the zero-strike call option transactions, the Company purchased in the aggregate approximately 26.8 million ADSs.

Parent Company Only Condensed Financial Information

12 Months Ended

Dec. 31, 2018

Condensed Financial Information Disclosure [Abstract]

Parent Company Only Condensed Financial Information

30. Parent Company Only Condensed Financial Information

The Company performed a test on the restricted net assets of its consolidated subsidiaries and VIEs in accordance with Securities and Exchange Commission Regulation S-X Rule 4-08 (e) (3), “General Notes to Financial Statements” and concluded that it was applicable for the Company to disclose the financial information for the Company only.

The subsidiaries did not pay any dividend to the Company for the years presented. Certain information and footnote disclosures generally included in financial statements prepared in accordance with U.S. GAAP have been condensed and omitted. The footnote disclosures contain supplemental information relating to the operations of the Company, as such, these statements are not the general-purpose financial statements of the reporting entity and should be read in conjunction with the notes to the consolidated financial statements of the Company.

The Company did not have significant capital and other commitments, or guarantees as of December 31, 2018.

Condensed Balance Sheets

	As of December 31,
	2017			2018			2018
	RMB			RMB			US$
							Note 2(e)
ASSETS
Current assets:
Cash and cash equivalents		23,270			17,179			2,499
Amounts due from related parties		1,243,251			20,701			3,011
Prepayments and other current assets		1,642			54,847			7,977
Total current assets		1,268,163			92,727			13,487
Non-current assets:
Investments in subsidiaries and VIEs		6,977,051			8,891,882			1,293,271
Total non-current assets		6,977,051			8,891,882			1,293,271
Total assets		8,245,214			8,984,609			1,306,758
LIABILITIES
Current liabilities:
Amounts due to related parties		135,490			2,046,971			297,720
Accruals and other liabilities		55,027			913			134
Total current liabilities		190,517			2,047,884			297,854
Deferred revenue		—			99,684			14,498
Total non-current liabilities		—			99,684			14,498
Total liabilities		190,517			2,147,568			312,352
MEZZANINE EQUITY
Series A-1 and A-2 convertible redeemable preferred shares		5,011,731			—			—
Series A-3 convertible redeemable preferred shares		427,129			—			—
Series B convertible redeemable preferred shares		2,294,980			—			—
Series C convertible redeemable preferred shares		4,454,596			—			—
Series D convertible redeemable preferred shares		7,547,760			—			—
Receivable from a holder of Series D convertible redeemable preferred shares		(78,410	)		—			—
Total mezzanine equity		19,657,786			—			—
SHAREHOLDERS’ (DEFICIT)/EQUITY
Ordinary shares		60			—			—
Class A Ordinary Shares		—			1,329			193
Class B Ordinary Shares		—			226			33
Class C Ordinary Shares		—			254			37
Treasury shares		(9,186	)		(9,186	)		(1,336	)
Additional paid in capital		131,907			41,918,936			6,096,856
Accumulated other comprehensive income/(loss)		(13,922	)		(34,708	)		(5,048	)
Accumulated deficit		(11,711,948	)		(35,039,810	)		(5,096,329	)
Total shareholders’ (deficit)/equity		(11,603,089	)		6,837,041			994,406
Total liabilities, mezzanine equity and shareholders’ (deficit)/equity		8,245,214			8,984,609			1,306,758

Condensed Statements of Comprehensive Loss

	For the Year ended December 31,
	2016			2017			2018			2018
	RMB			RMB			RMB			US$
										Note 2(e)
Operating expenses:
Selling, general and administrative		(24,684	)		(52,518	)		(178,479	)		(25,959	)
Total operating expenses		(24,684	)		(52,518	)		(178,479	)		(25,959	)
Loss from operations		(24,684	)		(52,518	)		(178,479	)		(25,959	)
Interest income		24,309			2,391			7,692			1,119
Interest expense		—			(12,389	)		—			—
Equity in loss of subsidiaries and VIEs		(2,539,323	)		(4,924,897	)		(9,432,640	)		(1,371,921	)
Investment income		2,670			3,498			—			—
Other loss, net		712			(819	)		6,153			895
Loss before income tax expense		(2,536,316	)		(4,984,734	)		(9,597,274	)		(1,395,866	)
Income tax expense		—			—			—			—
Net loss		(2,536,316	)		(4,984,734	)		(9,597,274	)		(1,395,866	)
Accretion on convertible redeemable preferred shares to redemption value		(981,233	)		(2,576,935	)		(13,667,291	)		(1,987,825	)
Accretion on redeemable non-controlling interests to redemption value		—			—			(63,297	)		(9,206	)
Net loss attributable to ordinary shareholders of NIO Inc.		(3,517,549	)		(7,561,669	)		(23,327,862	)		(3,392,897	)

Condensed Statements of Cash Flows

	For The Year ended December 31,
	2016			2017			2018			2018
	RMB			RMB			RMB			US$
										Note 2(e)
CASH FLOWS FROM OPERATING ACTIVITIES
Net cash used in operating activities		(2,540,639	)		(4,920,905	)		3,917,654			569,799
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of trading securities		3,118,559			1,340,911			—			—
Purchase of held for trading securities		(2,346,261	)		(1,337,413	)		—			—
Acquisitions of equity investees		(669,433	)		(6,223,178	)		(11,693,144	)		(1,700,697	)
Net cash used in investing activities		102,865			(6,219,680	)		(11,693,144	)		(1,700,697	)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of stock options		—			6,207			42,251			6,145
Repurchase of restricted shares		—			—			(7,490	)		(1,089	)
Proceeds from issuance of convertible promissory note		—			312,624			—			—
Repayment of convertible promissory note		—			(325,013	)		—			—
Repayment of non-recourse loan		—			—			82,863			12,052
Proceeds from issuance of ordinary shares, net of issuance costs		—			—			7,566,470			1,100,497
Proceeds from issuance of convertible redeemable preferred shares, net of issuance costs		2,260,444			11,093,377			78,651			11,439
Net cash provided by financing activities		2,260,444			11,087,195			7,762,745			1,129,044
Effects of exchange rate changes on cash and cash equivalents		(7,323	)		(3,031	)		6,654			969
NET DECREASE IN CASH AND CASH EQUIVALENTS		(184,653	)		(56,421	)		(6,091	)		(885	)
Cash and cash equivalents at beginning of the year		264,344			79,691			23,270			3,384
Cash and cash equivalents at end of the year		79,691			23,270			17,179			2,499

Basis of presentation

The Company’s accounting policies are the same as the Group’s accounting policies with the exception of the accounting for the investments in subsidiaries and VIEs.

For the Company only condensed financial information, the Company records its investments in subsidiaries and VIEs under the equity method of accounting as prescribed in ASC 323, Investments—Equity Method and Joint Ventures.

Such investments are presented on the Condensed Balance Sheets as “Investments in subsidiaries and VIEs” and shares in the subsidiaries and VIEs’ loss are presented as “Equity in loss of subsidiaries and VIEs” on the Condensed Statements of Comprehensive Loss. The parent company only condensed financial information should be read in conjunction with the Group’ consolidated financial statements.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Basis of presentation

(a) Basis of presentation

Principles of consolidation

(b) Principles of consolidation

The consolidated financial statements include the financial statements of the Company, its subsidiaries and the VIE for which the Company is the ultimate primary beneficiary.

Use of estimates

(c) Use of estimates

Functional currency and foreign currency translation

(d) Functional currency and foreign currency translation

Convenience translation

(e) Convenience translation

Fair value

(f) Fair value

Level 1—Quoted prices (unadjusted) in active markets for identical assets or liabilities.

Level 2—Observable, market-based inputs, other than quoted prices, in active markets for identical assets or liabilities.

Level 3—Unobservable inputs to the valuation methodology that are significant to the measurement of the fair value of the assets or liabilities.

Cash, cash equivalents and restricted cash

(g) Cash, cash equivalents and restricted cash

Cash, cash equivalents and restricted cash as reported in the consolidated statement of cash flows are presented separately on our consolidated balance sheet as follows:

	December 31, 2017		December 31 2018
Cash and cash equivalents		7,505,954		3,133,847
Restricted cash		10,606		57,012
Long-term restricted cash		14,293		33,528
Total		7,530,853		3,224,387

Short-term investment

(h) Short-term investment

Account Receivable and Allowance for Doubtful Accounts

(i) Account Receivable and Allowance for Doubtful Accounts

Inventory

(j) Inventory

No inventory write-downs were recognized for the years ended December 31, 2016 and 2017 and 2018.

Trading securities

(k) Trading securities

Property, plant and equipment, net

(l) Property, plant and equipment, net

The estimated useful lives are as follows:

		Useful lives
Building and constructions		20 years
Production facilities		10 years
Charging & battery swap infrastructure		5 years
R&D equipment		5 years
Computer and electronic equipment		3 years
Purchased software		3 years
Leasehold improvements		Shorter of the estimated useful life or remaining lease term
Others		3 to 5 years

Depreciation for mold and tooling is computed using the units-of-production method whereby capitalized costs are amortized over the total estimated productive life of the related assets.

Intangible assets, net

(m) Intangible assets, net

Intangible assets are carried at cost less accumulated amortization and impairment, if any. Intangible assets are amortized using the straight-line method over the estimated useful lives as below:

		Useful lives
Domain names and others		5 years
License		3 years

The estimated useful lives of amortized intangible assets are reassessed if circumstances occur that indicate the original estimated useful lives have changed.

Land use rights, net

(n) Land use rights, net

Long-term investments

(o) Long-term investments

Impairment of long-lived assets

(p) Impairment of long-lived assets

Revenue recognition

(q) Revenue recognition

•

provides all of the benefits received and consumed simultaneously by the customer;

•

creates and enhances an asset that the customer controls as the Group performs; or

•

does not create an asset with an alternative use to the Group and the Group has an enforceable right to payment for performance completed to date.

Vehicle sales

Sales of Energy and Service Packages

Incentives

(i) Sales of ES8 vehicle

(ii) Sales of Energy Package

(iii) Other scenarios

Similar to the reasons above, the Group estimates no points forfeiture currently and continues to assess when and if a forfeiture rate should be applied.

As of December 31, 2017 and 2018, liabilities recorded related to unredeemed points were RMB16,460 and RMB143,868, respectively.

Practical expedients and exemptions

Cost of Sales

(r) Cost of Sales

Vehicle

Service and Other

Sales and marketing expenses

(s) Sales and marketing expenses

Research and development expenses

(t) Research and development expenses

General and administrative expenses

(u) General and administrative expenses

Employee benefits

(v) Employee benefits

Government grants

(w) Government grants

Income taxes

(x) Income taxes

Share-based compensation

(y) Share-based compensation

Comprehensive income/(loss)

(z) Comprehensive income/(loss)

Leases

(aa) Leases

Dividends

(ab) Dividends

Dividends are recognized when declared. No dividends were declared for the years ended December 31, 2016, 2017 and 2018, respectively.

Earnings/(Loss) per share

(ac) Earnings/(Loss) per share

Segment reporting

(ad) Segment reporting

Organization and Nature of Operations (Tables)

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of principal subsidiaries and VIE's

Subsidiaries	Equity interest held			Place and date of incorporation or date of acquisition	Principal activities
NIO NextEV Limited (“NIO HK”) (formerly known as NextEV Limited)		100	%	Hong Kong, February 2015	Investment holding
NIO GmbH (formerly known as NextEV GmbH)		100	%	Germany, May 2015	Design and technology development
NIO Co., Ltd. (“NIO SH”) (formerly known as NextEV Co., Ltd.)		100	%	Shanghai, PRC, May 2015	Headquarter and technology development
NIO USA, Inc. (“NIO US”) (formerly known as NextEV USA, Inc.)		100	%	United States, November 2015	Technology development
XPT Limited (“XPT”)		100	%	Hong Kong, December 2015	Investment holding
NIO NextEV (UK) Limited (formerly known as NextEV (UK) Limited)		100	%	United Kingdom, February 2016	Marketing and technology development
NIO Sport Limited (“NIO Sport”) (formerly known as NextEV NIO Sport Limited)		100	%	Hong Kong, April 2016	Racing management
XPT Technology Limited (“XPT Technology”)		100	%	Hong Kong, April 2016	Investment holding
XPT Inc. (“XPT US”)		100	%	United States, April 2016	Technology development
XPT (Jiangsu) Investment Co., Ltd. (“XPT Jiangsu”)		100	%	Jiangsu, PRC, May 2016	Investment holding
Shanghai XPT Technology Limited		100	%	Shanghai, PRC, May 2016	Technology development
XPT (Nanjing) E-Powertrain Technology Co., Ltd. (“XPT NJEP”)		100	%	Nanjing, PRC, July 2016	Manufacturing of E-Powertrain
XPT (Nanjing) Energy Storage System Co., Ltd. (“XPT NJES”)		100	%	Nanjing, PRC, October 2016	Manufacturing of battery pack
NIO Power Express Limited (“PE HK)		100	%	Hong Kong, January 2017	Investment holding
NextEV User Enterprise Limited (“UE HK”)		100	%	Hong Kong, February 2017	Investment holding
Shanghai NIO Sales and Services Co., Ltd. (“UE CNHC”)		100	%	Shanghai, PRC, March 2017	Investment holding and sales and after sales management
NIO Energy Investment (Hubei) Co., Ltd. (“PE CNHC”)		100	%	Wuhan PRC, April 2017	Investment holding
Wuhan NIO Energy Co., Ltd. (“PE WHJV”)		100	%	Wuhan, PRC, May 2017	Investment holding
XTRONICS (Nanjing) Automotive Intelligent Technologies Co. Ltd. (“XPT NJWL”)		50	%	Nanjing, PRC, June 2017	Manufacturing of components
XPT (Jiangsu) Automotive Technology Co., Ltd. (“XPT AUTO”)		100	%	Nanjing, PRC, May 2018	Investment holding

VIE and VIE’s subsidiaries	Economic interest held			Place and Date of incorporation or date of acquisition
Prime Hubs Limited (“Prime Hubs”)		100	%	BVI, October 2014
NIO Technology Co., Ltd. (“NIO SHTECH”) (formerly known as Shanghai NextEV Technology Co., Ltd.)		100	%	Shanghai, PRC, November 2014
Beijing NIO Network Technology Co., Ltd. (“NIO BJTECH”)		100	%	Beijing, PRC, July 2017
Shanghai Anbin Technology Co., Ltd. (“NIO ABTECH”)		100	%	Shanghai, PRC, April 2018

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Schedule of Cash and Cash Equivalents [Table Text Block]

	December 31, 2017		December 31 2018
Cash and cash equivalents		7,505,954		3,133,847
Restricted cash		10,606		57,012
Long-term restricted cash		14,293		33,528
Total		7,530,853		3,224,387

Schedule of estimate useful life of property, plant and equipment

		Useful lives
Building and constructions		20 years
Production facilities		10 years
Charging & battery swap infrastructure		5 years
R&D equipment		5 years
Computer and electronic equipment		3 years
Purchased software		3 years
Leasehold improvements		Shorter of the estimated useful life or remaining lease term
Others		3 to 5 years

Schedule of estimate useful life of intangible assets, net

		Useful lives
Domain names and others		5 years
License		3 years

Inventory (Tables)

12 Months Ended

Dec. 31, 2018

Inventory Disclosure [Abstract]

Schedule of inventory

	December 31, 2017		December 31, 2018
Raw materials		44,061		696,005
Work in process		22,262		6,727
Finished Goods		-		723,591
Merchandise		23,141		38,916
Total		89,464		1,465,239

Prepayments and Other Current Assets (Tables)

12 Months Ended

Dec. 31, 2018

Prepayments And Other Current Assets [Abstract]

Schedule of prepayments and other current assets

	December 31, 2017		December 31, 2018
Deductible VAT input		456,774		1,018,766
Prepayment to vendors		185,401		333,367
Deposits		12,582		23,321
Other receivables		19,668		138,803
Total		674,425		1,514,257

Property, Plant and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment, Net [Abstract]

Schedule of property, plant and equipment

	December 31, 2017			December 31, 2018
Construction in process		1,016,643			1,289,611
Mold and tooling		2,619			1,032,685
Leasehold improvements		413,368			653,298
Building and construction		-			481,121
Charging & battery swap infrastructure		-			470,506
Production facilities		134,080			456,569
Computer and electronic equipment		178,534			393,931
R&D equipment		173,741			320,362
Purchased software		135,775			286,034
Others		77,681			146,869
Subtotal		2,132,441			5,530,986
Less: Accumulated depreciation		(221,428	)		(677,829	)
Total property, plant and equipment, net		1,911,013			4,853,157

Intangible Assets, Net (Tables)

12 Months Ended

Dec. 31, 2018

Finite-Lived Intangible Assets, Net [Abstract]

Schedule of impaired intangible assets

	December 31, 2017							December 31, 2018
	Gross carrying value		Accumulated amortization			Net carrying value		Gross carrying value		Accumulated amortization			Net carrying value
Domain names and others		4,230		(1,017	)		3,213		5,269		(1,974	)		3,295
License		3,199		(1,955	)		1,244		3,161		(2,986	)		175
Total intangible assets, net		7,429		(2,972	)		4,457		8,430		(4,960	)		3,470

Land Use Rights, Net (Tables)

12 Months Ended

Dec. 31, 2018

Land Use Rights, Net [Abstract]

Schedule of land user rights, net

	December 31, 2017		December 31, 2018
Land use rights		—		216,489
Less: Accumulated amortization—land use rights		—		(2,827	)
Total land use rights, net		—		213,662

Other Non-current Assets (Tables)

12 Months Ended

Dec. 31, 2018

Other Assets, Noncurrent [Abstract]

Schedule of other non current assets

	December 31, 2017		December 31, 2018
Long-term deposits		80,168		616,199
Receivables of installment payments for battery		-		574,677
Prepayments for purchase of property and equipment		50,882		159,341
Others		91		62,613
Total		131,141		1,412,830

Accruals and Other Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Accruals And Other Liabilities [Abstract]

Schedule of accruals and other liabilities

	December 31, 2017		December 31, 2018
Payables for purchase of property and equipment		410,726		1,027,377
Payable for R&D expenses		247,923		437,731
Payables for marketing events		37,933		423,953
Salaries and benefits payable		170,274		402,163
Accrued expenses		199,087		308,486
Advance from customers		68,439		233,767
Current portion of deferred revenue		-		108,250
Current portion of deferred construction allowance		-		87,330
Investment deposit from investors		-		47,124
Warranty		-		46,574
Payables for traveling expenses		10,678		43,147
Interest payables		24,320		2,584
Non-recourse loan		55,028		-
Other payables		61,184		215,195
Total		1,285,592		3,383,681

Borrowings (Tables)

12 Months Ended

Dec. 31, 2018

Long Term Borrowings [Abstract]

Schedule of long-term borrowings

	December 31, 2017		December 31, 2018
Short-term borrowing		28,787		1,870,000
Current portion of long-term borrowings		-		198,852
Long-term borrowings:
Bank loan		454,901		766,592
Loan from joint investor		187,500		401,420
Total		671,188		3,236,864

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Other Non-Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Other Liabilities, Noncurrent [Abstract]

Schedule of other noncurrent liabilities

	December 31, 2017		December 31, 2018

Deferred government grants		30,416		351,896
Deferred revenue		—		193,524
Warranty		—		130,719
Rental payable		48,926		129,995
Deferred construction allowance		61,771		124,678
Total		141,113		930,812

Revenues (Tables)

12 Months Ended

Dec. 31, 2018

Disaggregation of Revenue [Abstract]

Schedule of revenue

	For the Year Ended December 31,
	2016		2017		2018
Vehicle sales		—		—		4,852,470
Sales of charging pile		—		—		82,184
Sales of Packages		—		—		10,220
Others		—		—		6,297
Total		—		—		4,951,171

Deferred Revenue (Tables)

12 Months Ended

Dec. 31, 2018

Deferred Revenue Disclosure [Abstract]

Schedule of reconciliation in current reporting period related to carried-forward deferred revenue

	For the Year Ended December 31
	2016		2017		2018
Deferred revenue – beginning of year		—		—		—
Additions		—		—		384,116
Recognition		—		—		(82,342	)
Deferred revenue – end of year		—		—		301,774

Research and Development Expenses (Tables)

12 Months Ended

Dec. 31, 2018

Research and Development Expense [Abstract]

Schedule of research and development expenses

	Year Ended December 31,
	2016		2017		2018
Employee compensation		451,284		1,004,835		1,850,886
Design and development expenses		948,753		1,455,297		1,827,980
Travel and entertainment expenses		27,085		60,622		104,949
Depreciation and amortization expenses		7,819		38,940		103,427
Rental and related expenses		10,485		12,367		33,105
Others		19,927		30,828		77,595
Total		1,465,353		2,602,889		3,997,942

Selling, General and Administrative Expenses (Tables)

12 Months Ended

Dec. 31, 2018

Selling, General and Administrative Expense [Abstract]

Schedule of selling, general and administrative expenses

	Year Ended December 31,
	2016		2017		2018
Employee compensation		473,302		929,928		2,256,455
Marketing and promotional expenses		239,549		523,535		1,158,519
Professional services		133,368		238,740		578,469
Rental and related expenses		91,535		216,111		450,113
Depreciation and amortization expenses		38,268		128,918		249,765
Travel and entertainment expenses		32,572		71,278		197,187
IT consumable, office supply and other low value consumable		21,621		114,668		167,323
Others		106,972		127,529		283,959
Total		1,137,187		2,350,707		5,341,790

Convertible Redeemable Preferred Shares (Tables)

12 Months Ended

Dec. 31, 2018

Convertible Redeemable Preferred Shares [Abstract]

Schedule of convertible redeemable preferred shares activities

	Series A-1 & A-2				Series A-3				Series B				Series C				Series D				Total
	Number of shares		Amount (RMB)		Number of shares		Amount (RMB)		Number of shares		Amount (RMB)		Number of shares		Amount (RMB)		Number of shares		Amount (RMB)		Number of shares		Amount (RMB)
Balances as of January 1, 2016		295,000,000		1,340,034		24,210,431		276,695		—		—		—		—		—		—		319,210,431		1,616,729
Proceeds from Series A-1 Preferred Shares		—		401,478		—		—		—		—		—		—		—		—		—		401,478
Issuance of preferred shares		—		—		—		—		102,144,675		1,862,134		—		—		—		—		102,144,675		1,862,134
Accretion on convertible redeemable preferred shares to redemption value		—		798,481		—		29,983		—		152,769		—		—		—		—		—		981,233
Balances as of December 31, 2016		295,000,000		2,539,993		24,210,431		306,678		102,144,675		2,014,903		—		—		—		—		421,355,106		4,861,574
Proceeds from Series A-1 Preferred Shares		—		266,511		—		—		—		—		—		—		—		—		—		266,511
Issuance of preferred shares		—		—		—		—		12,722,646		240,066		166,205,830		4,398,313		213,585,003		7,314,387		392,513,479		11,952,766
Accretion on convertible redeemable preferred shares to redemption value		—		2,205,227		—		120,451		—		40,011		—		56,283		—		154,963		—		2,576,935
Balances as of December 31, 2017		295,000,000		5,011,731		24,210,431		427,129		114,867,321		2,294,980		166,205,830		4,454,596		213,585,003		7,469,350		813,868,585		19,657,786

	Series A-1 & A-2						Series A-3						Series B						Series C						Series D						Total
	Number of shares			Amount (RMB)			Number of shares			Amount (RMB)			Number of shares			Amount (RMB)			Number of shares			Amount (RMB)			Number of shares			Amount (RMB)			Number of shares			Amount (RMB)
Balances as of December 31, 2017		295,000,000			5,011,731			24,210,431			427,129			114,867,321			2,294,980			166,205,830			4,454,596			213,585,003			7,469,350			813,868,585			19,657,786
Issuance of Series A-3 Preferred Shares (note 24(c))		—			—			7,509,933			—			—			—			—			—			—			—			7,509,933			—
Proceeds from Series D Preferred Shares		—			—			—			—			—			—			—			—			—			78,651			—			78,651
Accretion on convertible redeemable preferred shares to redemption value		—			7,091,163			—			565,979			—			2,417,979			—			2,375,943			—			1,216,227			—			13,667,291
Conversion of Series A-1 and A-2 Preferred Shares to Ordinary shares		(295,000,000	)		(12,102,894	)		—			—			—			—			—			—			—			—			(295,000,000	)		(12,102,894	)
Conversion of Series A-3 Preferred Shares to Ordinary shares		—			—			(31,720,364	)		(993,108	)		—			—			—			—			—			—			(31,720,364	)		(993,108	)
Conversion of Series B Preferred Shares to Ordinary shares		—			—			—			—			(114,867,321	)		(4,712,959	)		—			—			—			—			(114,867,321	)		(4,712,959	)
Conversion of Series C Preferred Shares to Ordinary shares		—			—			—			—			—			—			(166,205,830	)		(6,830,539	)		—			—			(166,205,830	)		(6,830,539	)
Conversion of Series D Preferred Shares to Ordinary shares		—			—			—			—			—			—			—			—			(213,585,003	)		(8,764,228	)		(213,585,003	)		(8,764,228	)
Balances as of December 31, 2018		—			—			—			—			—			—			—			—			—			—			—			—

Share-based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of compensation expenses recognized for share based awards granted

	For the Year Ended December 31,
	2016		2017		2018
Cost of sales		—		—		9,289
Research and development expenses		14,484		23,210		109,124
Selling, general and administrative expenses		62,200		67,086		561,055
Total		76,684		90,296		679,468

Share Options | NIO Incentive Plans

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of stock option activity

	Number of Options Outstanding			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life		Aggregate Intrinsic Value
				US$		In Years		US$
Outstanding as of December 31, 2015		—			—		—		—
Granted		53,576,606			0.32		—		—
Cancelled		(945,346	)		0.39		—		—
Expired		(7,706	)		0.10		—		—
Outstanding as of December 31, 2016		52,623,554			0.32		8.30		51,506
Granted		13,460,477			1.46		—		—
Exercised		(2,723,540	)		0.39		—		—
Cancelled		(5,236,562	)		0.44		—		—
Expired		(348,015	)		0.25		—		—
Outstanding as of December 31, 2017		57,775,914			0.57		8.52		114,299
Granted		47,216,792			2.79		—		—
Exercised		(7,732,317	)		0.40		—		—
Cancelled		(5,498,453	)		1.17		—		—
Expired		(687,796	)		0.62		—		—
Outstanding as of December 31, 2018		91,074,140			1.69		8.23		425,988
Vested and expected to vest as of December 31, 2016		50,782,627			—		—		49,245
Exercisable as of December 31, 2016		1,297,535			—		—		1,336
Vested and expected to vest as of December 31, 2017		55,832,678			—		—		107,299
Exercisable as of December 31, 2017		5,089,894			—		—		11,070
Vested and expected to vest as of December 31, 2018		99,702,386			—		—		467,127
Exercisable as of December 31, 2018		32,959,964			—		—		185,787

Schedule of weighted average assumptions used

	2016			2017			2018
Exercise price (US$)		0.10-0.61			0.61-2.55			0.10 - 6.74
Fair value of the ordinary shares on the date of option grant (US$)		0.96-1.30			1.30-2.55			3.38 - 6.74
Risk-free interest rate		1.46%-1.78	%		2.31%-2.40	%		2.74% - 3.15	%
Expected term (in years)		10			10			7 - 10
Expected dividend yield		0	%		0	%		0	%
Expected volatility		54	%		51%-52	%		47% - 51	%
Expected forfeiture rate (post-vesting)		5	%		5	%		5% - 8	%

Restricted shares | Employees | Prime Hubs Restricted Shares Plan (the "Prime Hubs Plan")

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of restricted shares activity

Employees	Number of Shares Outstanding			Weighted Average Grant Date Fair Value
				US$
Unvested as of December 31, 2015		13,450,000			0.72
Vested		(3,362,500	)		0.72
Forfeited		(1,687,500	)		0.72
Unvested as of December 31, 2016		8,400,000			0.72
Granted		2,000,000			2.05
Vested		(3,133,329	)		0.84
Forfeited		(208,333	)		0.72
Unvested as of December 31, 2017		7,058,338			1.04
Vested		(7,058,338	)		1.04
Unvested as of December 31, 2018		—			—

Restricted shares | Employees | US | NIO Incentive Plans

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of restricted shares activity

	Number of Restricted Shares Outstanding			Weighted Average Grant Date Fair Value
				US$
Unvested at December 31, 2015		—			—
Granted		3,103,809			0.96
Vested		(960,958	)		0.96
Forfeited		(305,464	)		0.96
Unvested at December 31, 2016		1,837,387			0.96
Vested		(470,015	)		0.96
Forfeited		(254,395	)		0.96
Unvested at December 31, 2017		1,112,977			0.96
Vested		(608,406	)		0.96
Forfeited		(63,058	)		0.96
Unvested at December 31, 2018		441,513			0.96

Restricted shares | Employees | Non-US | NIO Incentive Plans

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of restricted shares activity

	Number of Restricted Shares Outstanding			Weighted Average Grant Date Fair Value
				US$
Unvested at December 31, 2017		-			-
Granted		509,001			6.72
Vested		(445,104	)		6.74
Unvested at December 31, 2018		63,897			6.60

Restricted shares | Non Employees | Prime Hubs Restricted Shares Plan (the "Prime Hubs Plan")

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of restricted shares activity

Non-Employees	Number of Shares Outstanding			Weighted Average Grant Date Fair Value
				US$
Unvested as of December 31, 2015		2,950,000			1.25
Vested		(2,950,000	)		1.25
Unvested as of December 31, 2016, 2017 and 2018		—			—

Stock liability (the "Award")

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of weighted average assumptions used

	2016			2017			2018
Exercise price		1.83			1.82			1.74
Fair value of the Preferred Shares on the measurement date		1.80			2.70			4.54
Risk-free interest rate		2	%		2	%		2	%
Remaining life (in years)		4.75			3.64			0.26
Expected dividend yield		0	%		0	%		0	%
Expected volatility		47-51	%		47-48	%		43%-44	%

Taxation (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of maximum applicable income tax rates of other countries

	For the Year Ended December 31,
	2016			2017			2018
United States		42.84	%		42.84	%		29.84	%
United Kingdom		20.00	%		19.25	%		19.00	%
Germany		32.98	%		32.98	%		32.98	%

Schedule of composition of income tax expense

	For the Year Ended December 31,
	2016		2017		2018
Current income tax expense		4,314		7,906		22,044

Schedule of reconciliation of the income tax expense

	For the Year Ended December 31,
	2016			2017			2018
Loss before income tax expense		(2,568,940	)		(5,013,268	)		(9,616,935	)
Income tax expense computed at PRC statutory income tax rate of 25%		(642,235	)		(1,253,318	)		(2,404,234	)
Non-deductible expenses		91,915			91,093			96,684
Foreign tax rates differential		52,495			(74,531	)		167,180
Additional 50% tax deduction for qualified research and development expenses		(46,527	)		(93,513	)		(216,993	)
Tax exempted interest income		(52	)		(845	)		(10,377	)
Effect of U.S. tax law change		—			165,898			—
US tax credits		(5,716	)		(52,185	)		(42,781	)
Prior year adjustments		3,594			(10,293	)		(1,422	)
Tax benefit not utilized		550,840			1,235,600			2,433,987
Income tax expense		4,314			7,906			22,044

Schedule of deferred tax assets

	As of December 31,
	2016			2017			2018
Deferred tax assets
Net operating loss carry-forwards		567,844			1,620,535			3,777,696
Accrued and prepaid expenses		39,174			84,320			255,240
Advertising expenses in excess of deduction limit		9,118			65,737			14,234
Tax credit carry-forwards		13,735			60,624			117,801
Property, plant and equipment, net		28,849			27,463			17,467
Deferred rent		9,478			8,699			36,729
Deferred Revenue		2,411			—			83,877
Unrealized financing cost		—			—			41,939
Intangible assets		1,643			7,104			15,687
Share-based compensation		637			4,106			8,962
Unrealized foreign exchange loss		—			55			55
Total deferred tax assets		672,889			1,878,643			4,369,687
Less: Valuation allowance		(672,889	)		(1,878,643	)		(4,369,687	)
Total deferred tax assets, net		—			—			—

Summary of valuation allowance

	As of December 31,
	2016		2017		2018
Valuation allowance
Balance at beginning of the year		—		672,889		1,878,643
Additions		672,889		1,205,754		2,491,044
Balance at end of the year		672,889		1,878,643		4,369,687

Schedule of expire in one to four years for deduction against future taxable profit

Loss expiring in 2019			4
Loss expiring in 2020			186,827
Loss expiring in 2021			1,335,168
Loss expiring in 2022			3,098,425
Loss expiring in 2023			6,931,086
Total			11,551,510

Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Schedule of loss per share

	For the Year Ended December 31,
	2016			2017			2018
Numerator:
Net loss		(2,573,254	)		(5,021,174	)		(9,638,979	)
Accretion on convertible redeemable preferred shares to redemption value		(981,233	)		(2,576,935	)		(13,667,291	)
Accretion on redeemable non-controlling interests to redemption value		—			—			(63,297	)
Net loss attributable to non-controlling interests		36,938			36,440			41,705
Net loss attributable to ordinary shareholders of NIO Inc. for basic/dilutive net loss per share		(3,517,549	)		(7,561,669	)		(23,327,862	)
Denominator:
Weighted-average number of ordinary shares outstanding — basic and diluted		16,697,527			21,801,525			332,153,211
Basic and diluted net loss per share attributable to ordinary shareholders of NIO Inc.		(210.66	)		(346.84	)		(70.23	)

Related Party Balances and Transactions (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of related party transactions

(i) Provision of service

	For the Year Ended December 31,
	2016		2017		2018
Shanghai NIO Hongling Investment Management Co., Ltd.		—		—		2,707
Shanghai Weishang Business Consulting Co.,Ltd.		—		—		905
Hubei Changjiang Nextev New Energy Investment Management Co.,Ltd.		—		11,121		—
Beijing CHJ Information Technology Co., Ltd.		—		4,588		—
Hubei Changjiang Nextev New Energy Industry Development Capital Partnership (Limited Partnership)		—		4,015		—
Jiangsu Xindian Automotive Co., Ltd.		—		1,785		—
		—		21,509		3,612

(ii) Acceptance of marketing and advertising service

	For the Year Ended December 31,
	2016		2017		2018
Beijing Xinyi Hudong Guanggao Co., Ltd.		—		8,021		28,245
Beijing Chehui Hudong Guanggao Co., Ltd.		—		544		6,915
Bite Shijie (Beijing) Keji Co., Ltd.		—		6,987		2,865
Beijing Bitauto Information Technology Co., Ltd.		—		—		32
		—		15,552		38,057

(iii) Loan to related party

	For the Year Ended December 31,
	2016		2017		2018
NIO Capital		—		—		66,166
Ningbo Meishan Bonded Port Area Weilan Investment Co., Ltd.		—		50,000		—
		—		50,000		66,166

(iv) Cost of manufacturing consignment

	For the Year Ended December 31,
	2016		2017		2018
Suzhou Zenlead XPT New Energy Technologies Co.,Ltd.		—		18,324		132,152

(v) Purchase of property and equipment

	For the Year Ended December 31,
	2016		2017		2018
Kunshan Siwopu Intelligent Equipment Co., Ltd.		—		—		11,107
Bite Shijie (Beijing) Keji Co., Ltd.		—		2,960		—
		—		2,960		11,107

(vi) Interest payable on behalf of related party

	For the Year Ended December 31,
	2016		2017		2018
Baidu Capital L.P.		—		21,671		8,065

(vii) Acceptance of R&D and maintenance service

	For the Year Ended December 31,
	2016		2017		2018
Suzhou Zenlead XPT New Energy Technologies Co.,Ltd.		—		—		14,776
Kunshan Siwopu Intelligent Equipment Co., Ltd.		—		—		2,436
		—		—		17,212

(viii) Payment on behalf of related party

	For the Year Ended December 31,
	2016		2017		2018
Nanjing Weibang Transmission Technology Co., Ltd.		—		—		2,790

Schedule of due from related parties

(i) Amounts due from related parties

	December 31, 2017		December 31, 2018
Ningbo Meishan Bonded Port Area Weilan Investment Co., Ltd.		50,000		50,000
NIO Capital		—		34,316
Kunshan Siwopu Intelligent Equipment Co., Ltd.		—		7,970
Nanjing Weibang Transmission Technology Co., Ltd.		—		2,790
Shanghai Weilan Hongling Investment Management Co., Ltd.		—		960
Baidu Capital L.P.		21,671		—
Beijing CHJ Information Technology Co., Ltd.		3,624		—
Bin Li		1,680		—
Jiangsu Xindian Automotive Co., Ltd.		1,627		—
Hubei Changjiang Nextev New Energy Investment Management Co., Ltd.		954		—
Total		79,556		96,036

Schedule of due to related parties

(ii) Amounts due to related parties

	December 31, 2017		December 31, 2018
Suzhou Zenlead XPT New Energy Technologies Co., Ltd.		19,466		210,868
Beijing Chehui Hudong Guanggao Co., Ltd.		576		4,085
Beijing Xinyi Hudong Guanggao Co., Ltd.		400		3,530
Kunshan Siwopu Intelligent Equipment Co., Ltd.		—		761
Bite Shijie (Beijing) Keji Co., Ltd. .		—		339
Bin Li		14,289		—
Lihong Qin		5,338		—
Total		40,069		219,583

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of capital expenditures contracted

	December 31, 2017		December 31, 2018
Property and equipment		1,250,612		1,454,031
Leasehold improvements		470,600		149,551
Total		1,721,212		1,603,582

Schedule of operating leases for minimum rentals

	December 31, 2017		December 31, 2018
Within one year		233,486		393,734
1 to 2 years		261,846		457,892
2 to 3 years		278,278		444,909
More than 3 years		912,356		1,091,911
Total		1,685,966		2,388,446

Parent Company Only Condensed Financial Information (Tables)

12 Months Ended

Dec. 31, 2018

Condensed Financial Information Disclosure [Abstract]

Schedule of condensed balance sheets

Condensed Balance Sheets

	As of December 31,
	2017			2018			2018
	RMB			RMB			US$
							Note 2(e)
ASSETS
Current assets:
Cash and cash equivalents		23,270			17,179			2,499
Amounts due from related parties		1,243,251			20,701			3,011
Prepayments and other current assets		1,642			54,847			7,977
Total current assets		1,268,163			92,727			13,487
Non-current assets:
Investments in subsidiaries and VIEs		6,977,051			8,891,882			1,293,271
Total non-current assets		6,977,051			8,891,882			1,293,271
Total assets		8,245,214			8,984,609			1,306,758
LIABILITIES
Current liabilities:
Amounts due to related parties		135,490			2,046,971			297,720
Accruals and other liabilities		55,027			913			134
Total current liabilities		190,517			2,047,884			297,854
Deferred revenue		—			99,684			14,498
Total non-current liabilities		—			99,684			14,498
Total liabilities		190,517			2,147,568			312,352
MEZZANINE EQUITY
Series A-1 and A-2 convertible redeemable preferred shares		5,011,731			—			—
Series A-3 convertible redeemable preferred shares		427,129			—			—
Series B convertible redeemable preferred shares		2,294,980			—			—
Series C convertible redeemable preferred shares		4,454,596			—			—
Series D convertible redeemable preferred shares		7,547,760			—			—
Receivable from a holder of Series D convertible redeemable preferred shares		(78,410	)		—			—
Total mezzanine equity		19,657,786			—			—
SHAREHOLDERS’ (DEFICIT)/EQUITY
Ordinary shares		60			—			—
Class A Ordinary Shares		—			1,329			193
Class B Ordinary Shares		—			226			33
Class C Ordinary Shares		—			254			37
Treasury shares		(9,186	)		(9,186	)		(1,336	)
Additional paid in capital		131,907			41,918,936			6,096,856
Accumulated other comprehensive income/(loss)		(13,922	)		(34,708	)		(5,048	)
Accumulated deficit		(11,711,948	)		(35,039,810	)		(5,096,329	)
Total shareholders’ (deficit)/equity		(11,603,089	)		6,837,041			994,406
Total liabilities, mezzanine equity and shareholders’ (deficit)/equity		8,245,214			8,984,609			1,306,758

Schedule of condensed statements of comprehensive loss

Condensed Statements of Comprehensive Loss

	For the Year ended December 31,
		2016			2017			2018			2018
		RMB			RMB			RMB			US$
											Note 2(e)
Operating expenses:
Selling, general and administrative			(24,684	)		(52,518	)		(178,479	)		(25,959	)
Total operating expenses			(24,684	)		(52,518	)		(178,479	)		(25,959	)
Loss from operations			(24,684	)		(52,518	)		(178,479	)		(25,959	)
Interest income			24,309			2,391			7,692			1,119
Interest expense			—			(12,389	)		—			—
Equity in loss of subsidiaries and VIEs			(2,539,323	)		(4,924,897	)		(9,432,640	)		(1,371,921	)
Investment income			2,670			3,498			—			—
Other loss, net			712			(819	)		6,153			895
Loss before income tax expense			(2,536,316	)		(4,984,734	)		(9,597,274	)		(1,395,866	)
Income tax expense			—			—			—			—
Net loss			(2,536,316	)		(4,984,734	)		(9,597,274	)		(1,395,866	)
Accretion on convertible redeemable preferred shares to redemption value			(981,233	)		(2,576,935	)		(13,667,291	)		(1,987,825	)
Accretion on redeemable non-controlling interests to redemption value			—			—			(63,297	)		(9,206	)
Net loss attributable to ordinary shareholders of NIO Inc.			(3,517,549	)		(7,561,669	)		(23,327,862	)		(3,392,897	)

Schedule of condensed statements of cash flows

Condensed Statements of Cash Flows

	For The Year ended December 31,
	2016			2017			2018			2018
	RMB			RMB			RMB			US$
										Note 2(e)
CASH FLOWS FROM OPERATING ACTIVITIES
Net cash used in operating activities		(2,540,639	)		(4,920,905	)		3,917,654			569,799
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of trading securities		3,118,559			1,340,911			—			—
Purchase of held for trading securities		(2,346,261	)		(1,337,413	)		—			—
Acquisitions of equity investees		(669,433	)		(6,223,178	)		(11,693,144	)		(1,700,697	)
Net cash used in investing activities		102,865			(6,219,680	)		(11,693,144	)		(1,700,697	)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of stock options		—			6,207			42,251			6,145
Repurchase of restricted shares		—			—			(7,490	)		(1,089	)
Proceeds from issuance of convertible promissory note		—			312,624			—			—
Repayment of convertible promissory note		—			(325,013	)		—			—
Repayment of non-recourse loan		—			—			82,863			12,052
Proceeds from issuance of ordinary shares, net of issuance costs		—			—			7,566,470			1,100,497
Proceeds from issuance of convertible redeemable preferred shares, net of issuance costs		2,260,444			11,093,377			78,651			11,439
Net cash provided by financing activities		2,260,444			11,087,195			7,762,745			1,129,044
Effects of exchange rate changes on cash and cash equivalents		(7,323	)		(3,031	)		6,654			969
NET DECREASE IN CASH AND CASH EQUIVALENTS		(184,653	)		(56,421	)		(6,091	)		(885	)
Cash and cash equivalents at beginning of the year		264,344			79,691			23,270			3,384
Cash and cash equivalents at end of the year		79,691			23,270			17,179			2,499

Organization and Nature of Operations (Details)	12 Months Ended
Organization and Nature of Operations (Details)	Dec. 31, 2018
NIO NextEV Limited ("NIO HK") (formerly known as NextEV Limited)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	100.00%
Entity Incorporation, State Country Name	Hong Kong
Entity Incorporation, Date of Incorporation	Feb. 28, 2015
Principal activities	Investment holding
NIO GmbH (formerly known as NextEV GmbH)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	100.00%
Entity Incorporation, State Country Name	Germany
Entity Incorporation, Date of Incorporation	May 31, 2015
Principal activities	Design and technology development
NIO Co., Ltd. ("NIO SH") (formerly known as NextEV Co., Ltd.)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	100.00%
Entity Incorporation, State Country Name	Shanghai, PRC
Entity Incorporation, Date of Incorporation	May 31, 2015
Principal activities	Headquarter and technology development
NIO USA, Inc. ("NIO US") (formerly known as NextEV USA, Inc.)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	100.00%
Entity Incorporation, State Country Name	United States
Entity Incorporation, Date of Incorporation	Nov. 30, 2015
Principal activities	Technology development
XPT Limited ("XPT")
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	100.00%
Entity Incorporation, State Country Name	Hong Kong
Entity Incorporation, Date of Incorporation	Dec. 31, 2015
Principal activities	Investment holding
NIO NextEV (UK) Limited (formerly known as NextEV (UK) Limited)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	100.00%
Entity Incorporation, State Country Name	United Kingdom
Entity Incorporation, Date of Incorporation	Feb. 29, 2016
Principal activities	Marketing and technology development
NIO Sport Limited ("NIO Sport") (formerly known as NextEV NIO Sport Limited)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	100.00%
Entity Incorporation, State Country Name	Hong Kong
Entity Incorporation, Date of Incorporation	Apr. 30, 2016
Principal activities	Racing management
XPT Technology Limited ("XPT Technology")
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	100.00%
Entity Incorporation, State Country Name	Hong Kong
Entity Incorporation, Date of Incorporation	Apr. 30, 2016
Principal activities	Investment holding
XPT Inc. ("XPT US")
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	100.00%
Entity Incorporation, State Country Name	United States
Entity Incorporation, Date of Incorporation	Apr. 30, 2016
Principal activities	Technology development
XPT (Jiangsu) Investment Co., Ltd. ("XPT Jiangsu")
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	100.00%
Entity Incorporation, State Country Name	Jiangsu, PRC
Entity Incorporation, Date of Incorporation	May 31, 2016
Principal activities	Investment holding
Shanghai XPT Technology Limited
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	100.00%
Entity Incorporation, State Country Name	Shanghai, PRC
Entity Incorporation, Date of Incorporation	May 31, 2016
Principal activities	Technology development
XPT (Nanjing) E-Powertrain Technology Co., Ltd. ("XPT NJEP")
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	100.00%
Entity Incorporation, State Country Name	Nanjing, PRC
Entity Incorporation, Date of Incorporation	Jul. 31, 2016
Principal activities	Manufacturing of E-Powertrain
XPT (Nanjing) Energy Storage System Co., Ltd. ("XPT NJES")
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	100.00%
Entity Incorporation, State Country Name	Nanjing, PRC
Entity Incorporation, Date of Incorporation	Oct. 31, 2016
Principal activities	Manufacturing of battery pack
NIO Power Express Limited ("PE HK")
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	100.00%
Entity Incorporation, State Country Name	Hong Kong
Entity Incorporation, Date of Incorporation	Jan. 31, 2017
Principal activities	Investment holding
NextEV User Enterprise Limited ("UE HK")
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	100.00%
Entity Incorporation, State Country Name	Hong Kong
Entity Incorporation, Date of Incorporation	Feb. 28, 2017
Principal activities	Investment holding
Shanghai NIO Sales and Services Co., Ltd. ("UE CNHC")
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	100.00%
Entity Incorporation, State Country Name	Shanghai, PRC
Entity Incorporation, Date of Incorporation	Mar. 31, 2017
Principal activities	Investment holding and sales and after sales management
NIO Energy Investment (Hubei) Co., Ltd. ("PE CNHC")
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	100.00%
Entity Incorporation, State Country Name	Wuhan PRC
Entity Incorporation, Date of Incorporation	Apr. 30, 2017
Principal activities	Investment holding
Wuhan NIO Energy Co., Ltd. ("PE WHJV")
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	100.00%
Entity Incorporation, State Country Name	Wuhan, PRC
Entity Incorporation, Date of Incorporation	May 31, 2017
Principal activities	Investment holding
XTRONICS (Nanjing) Automotive Intelligent Technologies Co. Ltd. ("XPT NJWL")
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	50.00%
Entity Incorporation, State Country Name	Nanjing, PRC
Entity Incorporation, Date of Incorporation	Jun. 30, 2017
Principal activities	Manufacturing of components
XPT (Jiangsu) Automotive Technology Co., Ltd. ("XPT Auto")
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest held	100.00%
Entity Incorporation, State Country Name	Nanjing, PRC
Entity Incorporation, Date of Incorporation	May 31, 2018
Principal activities	Investment holding

Organization and Nature of Operations (Details 1)	12 Months Ended
Organization and Nature of Operations (Details 1)	Dec. 31, 2018
Prime Hubs Limited ("Prime Hubs")
Variable Interest Entity [Line Items]
Economic interest held	100.00%
Entity Incorporation, State Country Name	BVI
Date of incorporation or acquisition	Oct. 31, 2014
NIO Technology Co., Ltd. ("NIO SHTECH") (formerly known as Shanghai NextEV Technology Co., Ltd.)
Variable Interest Entity [Line Items]
Economic interest held	100.00%
Entity Incorporation, State Country Name	Shanghai, PRC
Date of incorporation or acquisition	Nov. 30, 2014
Beijing NIO Network Technology Co., Ltd. ("NIO BJTECH")
Variable Interest Entity [Line Items]
Economic interest held	100.00%
Entity Incorporation, State Country Name	Beijing, PRC
Date of incorporation or acquisition	Jul. 31, 2017
Shanghai Anbin Technology Co., Ltd. ("NIO ABTECH")
Variable Interest Entity [Line Items]
Economic interest held	100.00%
Entity Incorporation, State Country Name	Shanghai, PRC
Date of incorporation or acquisition	Apr. 30, 2018

Organization and Nature of Operations (Detail Textuals) ¥ in Thousands, $ in Thousands					12 Months Ended
	Oct. 12, 2018 CNY (¥) shares	Oct. 12, 2018 USD ($) shares	Sep. 12, 2018 CNY (¥) shares	Sep. 12, 2018 USD ($) shares	Dec. 31, 2018 CNY (¥) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 CNY (¥) shares	Dec. 31, 2016 CNY (¥)	Dec. 31, 2018 USD ($)
Variable Interest Entity [Line Items]
Net loss					¥ (9,638,979)	$ (1,401,932)	¥ (5,021,174)	¥ (2,573,254)
Accumulated deficit					(35,039,810)		(11,711,948)		$ (5,096,329)
Net cash used in operating activities					(7,911,768)	$ (1,150,719)	(4,574,719)	¥ (2,201,564)
Working capital \| ¥					3,576,246		6,691,491
Cash and cash equivalents					3,133,847		¥ 7,505,954		$ 455,799
Initial public offering (the "IPO")
Variable Interest Entity [Line Items]
Total net proceeds public offering			¥ 6,568,291	$ 956,362
Number of newly issued ordinary shares			160,000,000	160,000,000
Over-allotment option
Variable Interest Entity [Line Items]
Total net proceeds public offering	¥ 962,746	$ 138,982
Number of newly issuing additional ordinary shares	24,000,000	24,000,000
Loan facility agreements with banks in China
Variable Interest Entity [Line Items]
Aggregate principal amount of notes \| ¥					¥ 7,095,000
Maturity date of loan					Dec. 15, 2025	Dec. 15, 2025
Prime Hubs
Variable Interest Entity [Line Items]
Number of share held by variable interest entities					4,250,002	4,250,002	26,900,001

Summary of Significant Accounting Policies (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Accounting Policies [Abstract]
Cash and cash equivalents	¥ 3,133,847	$ 455,799	¥ 7,505,954
Restricted cash	57,012	8,292	10,606
Long-term restricted cash	33,528	4,876	14,293
Total	¥ 3,224,387	$ 468,967	¥ 7,530,853	$ 1,095,317	¥ 596,631	¥ 347,109

Summary of Significant Accounting Policies (Details 1)	12 Months Ended
Summary of Significant Accounting Policies (Details 1)	Dec. 31, 2018
Building and constructions
Property, Plant and Equipment [Line Items]
Useful lives	20 years
Production facilities
Property, Plant and Equipment [Line Items]
Useful lives	10 years
Charging & battery swap infrastructure
Property, Plant and Equipment [Line Items]
Useful lives	5 years
R&D equipment
Property, Plant and Equipment [Line Items]
Useful lives	5 years
Computer and electronic equipment
Property, Plant and Equipment [Line Items]
Useful lives	3 years
Purchased software
Property, Plant and Equipment [Line Items]
Useful lives	3 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Useful lives	Shorter of the estimated useful life or remaining lease term
Others
Property, Plant and Equipment [Line Items]
Useful lives	3 to 5 years

Summary of Significant Accounting Policies (Details 2)	12 Months Ended
Summary of Significant Accounting Policies (Details 2)	Dec. 31, 2018
Domain names and others
Finite-Lived Intangible Assets [Line Items]
Useful lives	5 years
License
Finite-Lived Intangible Assets [Line Items]
Useful lives	3 years

Summary of Significant Accounting Policies (Detail Textuals) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Foreign currency translation adjustment (gains)/losses	¥ 20,786	$ 3,023	¥ 124,374	¥ (55,493)
Exchange rate (RMB per USD 1.00)	6.8755					6.8755
Changes in restricted cash in the consolidated cash flow	¥ 65,641		9,564	15,335
Liabilities recorded related to membership points	143,868		16,460
Advertising costs	218,060		63,427	4,095
Amounts of employee benefit expenses	¥ 517,787		¥ 231,070	105,955
Capital lease classification condition	a) ownership is transferred to the lessee by the end of the lease term, b) there is a bargain purchase option, c) the lease term is at least 75% of the property’s estimated remaining economic life, or d) the present value of the minimum lease payments at the beginning of the lease term is 90% or more of the fair value of the leased property to the lessor at the inception date. A capital lease is accounted for as if there was an acquisition of an asset and an incurrence of an obligation at the inception of the lease.	a) ownership is transferred to the lessee by the end of the lease term, b) there is a bargain purchase option, c) the lease term is at least 75% of the property’s estimated remaining economic life, or d) the present value of the minimum lease payments at the beginning of the lease term is 90% or more of the fair value of the leased property to the lessor at the inception date. A capital lease is accounted for as if there was an acquisition of an asset and an incurrence of an obligation at the inception of the lease.	a) ownership is transferred to the lessee by the end of the lease term, b) there is a bargain purchase option, c) the lease term is at least 75% of the property’s estimated remaining economic life, or d) the present value of the minimum lease payments at the beginning of the lease term is 90% or more of the fair value of the leased property to the lessor at the inception date. A capital lease is accounted for as if there was an acquisition of an asset and an incurrence of an obligation at the inception of the lease.
Operating lease expenses	¥ 490,936		¥ 228,478	¥ 102,020
Long-term investments	148,303		47,125			$ 21,570
Short-term investments	5,154,703					$ 749,720
Collateral for bank borrowings and letter of guarantee	¥ 1,775,000
Estimated forfeiture rate	0.00%	0.00%
Separate performance obligation recorded as contract liability (deferred revenue)	¥ 47,310
Reduction in revenue	441
Selling and marketing expenses	¥ 153,057		¥ 16,460
Land use rights, net
Summary Of Significant Accounting Policies [Line Items]
Useful lives	536 months	536 months

Recent Accounting Pronouncements (Detail Textuals) $ in Billions	Dec. 31, 2018 USD ($)
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets and total lease liabilities	$ 1.8
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets and total lease liabilities	$ 2.0

Concentration and Risks (Detail Textuals) - CNY (¥) ¥ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Risks and Uncertainties [Abstract]
Amount of cash and cash equivalents denominated in RMB subject to government controls	¥ 2,051,482	¥ 914,460
Amount of restricted cash denominated in RMB subject to government controls	¥ 2,051,482	¥ 914,460

Inventory (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)
Inventory Disclosure [Abstract]
Raw materials	¥ 696,005		¥ 44,061
Work in process	6,727		22,262
Finished Goods	723,591		0
Merchandise	38,916		23,141
Total	¥ 1,465,239	$ 213,110	¥ 89,464

Prepayments and Other Current Assets (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)
Prepaid Expense and Other Assets, Current [Abstract]
Deductible VAT input	¥ 1,018,766		¥ 456,774
Prepayment to vendors	333,367		185,401
Deposits	23,321		12,582
Other receivables	138,803		19,668
Total	¥ 1,514,257	$ 220,240	¥ 674,425

Property, Plant and Equipment, Net (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)
Property, Plant and Equipment [Line Items]
Subtotal	¥ 5,530,986		¥ 2,132,441
Less: Accumulated depreciation	(677,829)		(221,428)
Total property, plant and equipment, net	4,853,157	$ 705,862	1,911,013
Construction in process
Property, Plant and Equipment [Line Items]
Subtotal	1,289,611		1,016,643
Mold and tooling
Property, Plant and Equipment [Line Items]
Subtotal	1,032,685		2,619
Leasehold improvements
Property, Plant and Equipment [Line Items]
Subtotal	653,298		413,368
Building and constructions
Property, Plant and Equipment [Line Items]
Subtotal	481,121		0
Charging & battery swap infrastructure
Property, Plant and Equipment [Line Items]
Subtotal	470,506		0
Production facilities
Property, Plant and Equipment [Line Items]
Subtotal	456,569		134,080
Computer and electronic equipment
Property, Plant and Equipment [Line Items]
Subtotal	393,931		178,534
R&D equipment
Property, Plant and Equipment [Line Items]
Subtotal	320,362		173,741
Purchased software
Property, Plant and Equipment [Line Items]
Subtotal	286,034		135,775
Others
Property, Plant and Equipment [Line Items]
Subtotal	¥ 146,869		¥ 77,681

Property, Plant and Equipment, Net (Detail Textuals) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment, Net [Abstract]
Depreciation expenses	¥ 469,408	¥ 165,960	¥ 45,013

Intangible Assets, Net (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	¥ 8,430		¥ 7,429
Accumulated amortization	(4,960)		(2,972)
Net carrying value	3,470	$ 505	4,457
Domain names and others
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	5,269		4,230
Accumulated amortization	(1,974)		(1,017)
Net carrying value	3,295		3,213
License
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	3,161		3,199
Accumulated amortization	(2,986)		(1,955)
Net carrying value	¥ 175		¥ 1,244

Intangible Assets, Net (Detail Textuals) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets, Net [Abstract]
Amortization expenses	¥ 1,988	¥ 1,898	¥ 1,074

Land Use Rights, Net (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 USD ($)
Land Use Rights, Net [Abstract]
Land use rights	¥ 216,489	¥ 0
Less: Accumulated amortization-land use rights	(2,827)
Total land use rights, net	¥ 213,662	¥ 0		$ 31,076

Land Use Rights, Net (Detail Textuals) ¥ in Thousands	12 Months Ended
Land Use Rights, Net (Detail Textuals) ¥ in Thousands	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 USD ($)
Land Use Rights, Net [Abstract]
Amortization expenses for land use rights	¥ 2,827

Other Non-current Assets (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)
Other Assets, Noncurrent [Abstract]
Long-term deposits	¥ 616,199		¥ 80,168
Receivables of installment payments for battery	574,677		0
Prepayments for purchase of property and equipment	159,341		50,882
Others	62,613		91
Total	¥ 1,412,830	$ 205,488	¥ 131,141

Accruals and Other Liabilities (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)
Accruals And Other Liabilities [Abstract]
Payables for purchase of property and equipment	¥ 1,027,377		¥ 410,726
Payable for R&D expenses	437,731		247,923
Payables for marketing events	423,953		37,933
Salaries and benefits payable	402,163		170,274
Accrued expenses	308,486		199,087
Advance from customers	233,767		68,439
Current portion of deferred revenue	108,250		0
Current portion of deferred construction allowance	87,330		0
Investment deposit from investors	47,124		0
Warranty	46,574		0
Payables for traveling expenses	43,147		10,678
Interest payables	2,584		24,320
Non-recourse loan	0		55,028
Other payables	215,195		61,184
Total	¥ 3,383,681	$ 492,136	¥ 1,285,592

Borrowings (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)
Long Term Borrowings [Abstract]
Short-term borrowings	¥ 1,870,000	$ 271,980	¥ 28,787
Current portion of long-term borrowings	198,852	$ 28,922
Long-term borrowings:
Bank loan	766,592		454,901
Loan from joint investor	401,420		187,500
Total	¥ 3,236,864		¥ 671,188

Borrowings (Detail Textuals) ¥ in Thousands, $ in Thousands											3 Months Ended	12 Months Ended
Borrowings (Detail Textuals) ¥ in Thousands, $ in Thousands	Dec. 24, 2018 CNY (¥)	Dec. 20, 2018 CNY (¥)	Nov. 30, 2018 CNY (¥)	Aug. 17, 2018 CNY (¥)	May 14, 2018 CNY (¥)	Apr. 16, 2018 CNY (¥)	Feb. 02, 2018 CNY (¥)	Sep. 28, 2017 CNY (¥)	Jun. 30, 2017 CNY (¥)	May 17, 2017 CNY (¥)	Sep. 29, 2017 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2018 USD ($)	May 16, 2018 CNY (¥)	May 18, 2017 CNY (¥)	Sep. 07, 2016 CNY (¥)
Debt Instrument [Line Items]
Long-term borrowings												¥ 1,168,012	¥ 642,401	$ 169,880
Short-term borrowings												1,870,000	28,787	$ 271,980
Loan subscribed												401,420	¥ 187,500
Aggregate Collateralized By Bank Deposit												¥ 1,375,000
Maximum
Debt Instrument [Line Items]
Interest rate												5.22%	4.87%	5.22%
Minimum
Debt Instrument [Line Items]
Interest rate												4.35%	4.57%	4.35%
Joint investment agreement \| Nanjing Xingzhi Technology Industry Development Co., Ltd
Debt Instrument [Line Items]
Long-term borrowings															¥ 41,773		¥ 37,500
Joint investment agreement \| Wuhan Donghu New Technology Development Zone Management Committee ("Wuhan Donghu") \| Wuhan NIO Energy Co., Ltd. ("PE WHJV")
Debt Instrument [Line Items]
Loan subscribed																¥ 384,000
Rate of subscribed capital																49.00%
Injection of cash debt						¥ 234,000			¥ 50,000		¥ 100,000
Accrued interest												¥ 17,420	¥ 0
Secured loan agreement \| Bank of Nanjing
Debt Instrument [Line Items]
Aggregate principal amount of notes										¥ 685,000		¥ 674,279	¥ 454,901
Interest rate												5.80%	4.75%	5.80%
Maturity date										May 17, 2022
Loan agreement \| China Merchants Bank
Debt Instrument [Line Items]
Aggregate principal amount of notes								¥ 200,000				¥ 99,500
Maturity date								Sep. 27, 2019
Maturity period								2 years
Loan agreement \| China Merchants Bank \| Maximum
Debt Instrument [Line Items]
Interest rate												18.00%		18.00%
Loan agreement \| China Merchants Bank \| Minimum
Debt Instrument [Line Items]
Interest rate												10.00%		10.00%
Loan agreement \| China CITIC Bank
Debt Instrument [Line Items]
Aggregate principal amount of notes							¥ 50,000					¥ 49,750
Interest rate												10.00%		10.00%
Maturity date							Feb. 01, 2021
Maturity period												3 years
Loan agreement \| Bank of Shanghai
Debt Instrument [Line Items]
Aggregate principal amount of notes					¥ 1,500,000							¥ 27,000
Interest rate												20.00%		20.00%
Maturity date					Dec. 15, 2025
Maturity period												7 years 7 months
Loan agreement \| China CITIC Bank
Debt Instrument [Line Items]
Aggregate principal amount of notes				¥ 50,000								¥ 50,000
Interest rate												26.00%		26.00%
Maturity date				Mar. 07, 2021
Maturity period												2 years 7 months
Loan agreement \| Bank of Shanghai
Debt Instrument [Line Items]
Aggregate principal amount of notes	¥ 40,000	¥ 19,800	¥ 5,200									¥ 5,115
Interest rate												30.00%		30.00%
Maturity date	Nov. 30, 2021	Nov. 30, 2021	Nov. 30, 2021
Maturity period												2 years 11 months

Other Non-Current Liabilities (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)
Other Liabilities, Noncurrent [Abstract]
Deferred government grants	¥ 351,896		¥ 30,416
Deferred revenue	193,524		0
Warranty	130,719		0
Rental payable	129,995		48,926
Deferred construction allowance	124,678		61,771
Total	¥ 930,812	$ 135,382	¥ 141,113

Revenues (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
Revenues (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2016 USD ($)
Disaggregation of Revenue [Line Items]
Revenue by source	¥ 4,951,171		¥ 0	¥ 0
Vehicle sales
Disaggregation of Revenue [Line Items]
Revenue by source	4,852,470	$ 705,762	0
Sales of charging pile
Disaggregation of Revenue [Line Items]
Revenue by source	82,184		0
Sales of Packages
Disaggregation of Revenue [Line Items]
Revenue by source	10,220		0
Others
Disaggregation of Revenue [Line Items]
Revenue by source	¥ 6,297		¥ 0

Deferred Revenue (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
Deferred Revenue (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 USD ($)
Movement in Deferred Revenue [Roll Forward]
Deferred revenue - beginning of year	¥ 0
Additions	384,116	¥ 0	$ 0
Recognition	(82,342)	0	0
Deferred revenue - end of year	¥ 301,774	¥ 0	$ 0

Deferred Revenue (Detail Textuals) ¥ in Thousands	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 USD ($)
Deferred Revenue Disclosure [Abstract]
Unrecognized deferred revenue for charging pile, vehicle internet connection service, extended lifetime warranty service as well as points offered to customers	¥ 181,539
Unrecognized deferred revenue for ADR	¥ 99,684
Percentage of transaction price allocated to unsatisfied performance obligation during the period from January 1, 2019 to December 31, 2019	36.00%
Remaining percentage of revenue for performance obligation recognized during period from January 1, 2020 to December 31, 2023	64.00%

Manufacturing in collaboration with JAC (Detail Textuals) ¥ in Thousands	12 Months Ended
	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 USD ($)
Jianghuai Automobile Group Co., Ltd. ("JAC")
Manufacturing Collaboration [Line Items]
Actual manufacturing losses recorded as cost of sales	¥ 126,425

Research and Development Expenses (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Research and Development Expense [Abstract]
Employee compensation	¥ 1,850,886		¥ 1,004,835	¥ 451,284
Design and development expenses	1,827,980		1,455,297	948,753
Travel and entertainment expenses	104,949		60,622	27,085
Depreciation and amortization expenses	103,427		38,940	7,819
Rental and related expenses	33,105		12,367	10,485
Others	77,595		30,828	19,927
Total	¥ 3,997,942	$ 581,477	¥ 2,602,889	¥ 1,465,353

Selling, General and Administrative Expenses (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Selling, General and Administrative Expense [Abstract]
Employee compensation	¥ 2,256,455		¥ 929,928	¥ 473,302
Marketing and promotional expenses	1,158,519		523,535	239,549
Professional services	578,469		238,740	133,368
Rental and related expenses	450,113		216,111	91,535
Depreciation and amortization expenses	249,765		128,918	38,268
Travel and entertainment expenses	197,187		71,278	32,572
IT consumable, office supply and other low value consumable	167,323		114,668	21,621
Others	283,959		127,529	106,972
Total	¥ 5,341,790	$ 776,931	¥ 2,350,707	¥ 1,137,187

Acquisition and Investment in Equity Investees (Detail Textuals) - NIO Sport - Purchase agreement ¥ in Thousands, £ in Thousands, $ in Thousands	Jun. 01, 2017 CNY (¥)	Jun. 01, 2017 USD ($)	Jun. 01, 2017 GBP (£)
Business Acquisition [Line Items]
Business acquisition, ownership percentage	45.00%	45.00%	45.00%
Consideration paid	¥ 28,417	$ 4,000	£ 200

Convertible Promissory Note (Detail Textuals) - Convertible promissory note $ / shares in Units, ¥ in Thousands, $ in Thousands			1 Months Ended
	May 17, 2017 CNY (¥)	May 17, 2017 USD ($)	Feb. 16, 2017 USD ($) Shareholder	Feb. 16, 2017 CNY (¥)	Feb. 16, 2017 USD ($) $ / shares
Convertible Promissory Note [Line Items]
Aggregated principal amount				¥ 312,624	$ 48,000
Number of existing convertible redeemable preferred shareholder \| Shareholder			1
Interest rate				15.00%	15.00%
Maturity period			90 days
Percentage of conversion price			97.00%
Expected proceeds from sale of securities, qualified financing value \| $			$ 100,000
Repayments of convertible debt	¥ 12,389	$ 1,800
Series C convertible redeemable preferred shares
Convertible Promissory Note [Line Items]
Percentage of conversion price discount not be applicable to preferred shares			3.00%
Series B convertible redeemable preferred shares
Convertible Promissory Note [Line Items]
Conversion price \| $ / shares					$ 2.751

Convertible Redeemable Preferred Shares (Details) ¥ in Thousands, $ in Thousands	1 Months Ended												12 Months Ended
	Dec. 31, 2017 CNY (¥) shares	Dec. 31, 2017 USD ($) shares	Nov. 30, 2017 USD ($) shares	Jul. 31, 2017 USD ($) shares	Apr. 30, 2017 USD ($) shares	Mar. 31, 2017 USD ($) shares	Feb. 28, 2017 USD ($) shares	Sep. 30, 2016 USD ($) shares	Aug. 31, 2016 USD ($) shares	Jul. 31, 2016 USD ($) shares	Jun. 30, 2016 USD ($) shares	Sep. 30, 2015 USD ($) shares	Dec. 31, 2018 CNY (¥) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 CNY (¥) shares	Dec. 31, 2016 CNY (¥) shares
Increase (Decrease) in Temporary Equity [Roll Forward]
Balances													¥ 19,657,786		¥ 4,861,574	¥ 1,616,729
Balances (in shares) \| shares													813,868,585	813,868,585	421,355,106	319,210,431
Proceeds from Series A-1 Preferred Shares													¥ 78,651		¥ 266,511	¥ 401,478
Issuance of preferred shares															¥ 11,952,766	¥ 1,862,134
Issuance of preferred shares (in shares) \| shares													7,509,933	7,509,933	392,513,479	102,144,675
Accretion on convertible redeemable preferred shares to redemption value													¥ 13,667,291		¥ 2,576,935	¥ 981,233
Conversion of Series A-1 and A-2 Preferred Shares to Ordinary shares													¥ (12,102,894)
Conversion of Series A-1 and A-2 Preferred Shares to Ordinary shares (in shares) \| shares													(295,000,000)	(295,000,000)
Conversion of Series A-3 Preferred Shares to Ordinary shares													¥ (993,108)
Conversion of Series A-3 Preferred Shares to Ordinary shares (in shares) \| shares													(31,720,364)	(31,720,364)
Conversion of Series B Preferred Shares to Ordinary shares													¥ (4,712,959)
Conversion of Series B Preferred Shares to Ordinary shares (in shares) \| shares													(114,867,321)	(114,867,321)
Conversion of Series C Preferred Shares to Ordinary shares													¥ (6,830,539)
Conversion of Series C Preferred Shares to Ordinary shares (in shares) \| shares													(166,205,830)	(166,205,830)
Conversion of Series D Preferred Shares to Ordinary shares													¥ (8,764,228)
Conversion of Series D Preferred Shares to Ordinary shares (in shares) \| shares													(213,585,003)	(213,585,003)
Balances	¥ 19,657,786												¥ 0	$ 193,324	¥ 19,657,786	¥ 4,861,574
Balances (in shares) \| shares	813,868,585	813,868,585													813,868,585	421,355,106
Series A-1 & A-2
Increase (Decrease) in Temporary Equity [Roll Forward]
Balances													¥ 5,011,731		¥ 2,539,993	¥ 1,340,034
Balances (in shares) \| shares													295,000,000	295,000,000	295,000,000	295,000,000
Proceeds from Series A-1 Preferred Shares															¥ 266,511	¥ 401,478
Issuance of preferred shares															0
Accretion on convertible redeemable preferred shares to redemption value													¥ 7,091,163		2,205,227	798,481
Conversion of Series A-1 and A-2 Preferred Shares to Ordinary shares													¥ (12,102,894)
Conversion of Series A-1 and A-2 Preferred Shares to Ordinary shares (in shares) \| shares													(295,000,000)	(295,000,000)
Balances	¥ 5,011,731												¥ 0		¥ 5,011,731	¥ 2,539,993
Balances (in shares) \| shares	295,000,000	295,000,000													295,000,000	295,000,000
Series A-3
Increase (Decrease) in Temporary Equity [Roll Forward]
Balances													¥ 427,129		¥ 306,678	¥ 276,695
Balances (in shares) \| shares													24,210,431	24,210,431	24,210,431	24,210,431
Proceeds from Series A-1 Preferred Shares															¥ 0	¥ 0
Issuance of preferred shares												$ 40,000			0
Issuance of preferred shares (in shares) \| shares												24,210,431	7,509,933	7,509,933
Accretion on convertible redeemable preferred shares to redemption value													¥ 565,979		120,451	29,983
Conversion of Series A-3 Preferred Shares to Ordinary shares													¥ (993,108)
Conversion of Series A-3 Preferred Shares to Ordinary shares (in shares) \| shares													(31,720,364)	(31,720,364)
Balances	¥ 427,129												¥ 0		¥ 427,129	¥ 306,678
Balances (in shares) \| shares	24,210,431	24,210,431													24,210,431	24,210,431
Series B
Increase (Decrease) in Temporary Equity [Roll Forward]
Balances													¥ 2,294,980		¥ 2,014,903	¥ 0
Balances (in shares) \| shares													114,867,321	114,867,321	102,144,675	0
Proceeds from Series A-1 Preferred Shares															¥ 0	¥ 0
Issuance of preferred shares							$ 316,000	$ 316,000	$ 316,000	$ 316,000	$ 316,000				¥ 240,066	¥ 1,862,134
Issuance of preferred shares (in shares) \| shares							114,867,321	114,867,321	114,867,321	114,867,321	114,867,321				12,722,646	102,144,675
Accretion on convertible redeemable preferred shares to redemption value													¥ 2,417,979		¥ 40,011	¥ 152,769
Conversion of Series B Preferred Shares to Ordinary shares													¥ (4,712,959)
Conversion of Series B Preferred Shares to Ordinary shares (in shares) \| shares													(114,867,321)	(114,867,321)
Balances	¥ 2,294,980												¥ 0		¥ 2,294,980	¥ 2,014,903
Balances (in shares) \| shares	114,867,321	114,867,321													114,867,321	102,144,675
Series C
Increase (Decrease) in Temporary Equity [Roll Forward]
Balances													¥ 4,454,596		¥ 0	¥ 0
Balances (in shares) \| shares													166,205,830	166,205,830	0	0
Proceeds from Series A-1 Preferred Shares															¥ 0	¥ 0
Issuance of preferred shares				$ 645,709	$ 645,709	$ 645,709									¥ 4,398,313
Issuance of preferred shares (in shares) \| shares				166,205,830	166,205,830	166,205,830									166,205,830
Accretion on convertible redeemable preferred shares to redemption value													¥ 2,375,943		¥ 56,283	0
Conversion of Series C Preferred Shares to Ordinary shares													¥ (6,830,539)
Conversion of Series C Preferred Shares to Ordinary shares (in shares) \| shares													166,205,830	166,205,830
Balances	¥ 4,454,596												¥ 0		¥ 4,454,596	¥ 0
Balances (in shares) \| shares	166,205,830	166,205,830													166,205,830	0
Series D
Increase (Decrease) in Temporary Equity [Roll Forward]
Balances													¥ 7,469,350		¥ 0	¥ 0
Balances (in shares) \| shares													213,585,003	213,585,003	0	0
Proceeds from Series A-1 Preferred Shares													¥ 78,651		¥ 0	¥ 0
Issuance of preferred shares		$ 1,130,320	$ 1,130,320												¥ 7,314,387
Issuance of preferred shares (in shares) \| shares	211,156,415	211,156,415	211,156,415												213,585,003
Accretion on convertible redeemable preferred shares to redemption value													1,216,227		¥ 154,963	0
Conversion of Series D Preferred Shares to Ordinary shares													¥ (8,764,228)
Conversion of Series D Preferred Shares to Ordinary shares (in shares) \| shares													(213,585,003)	(213,585,003)
Balances	¥ 7,469,350												¥ 0		¥ 7,469,350	¥ 0
Balances (in shares) \| shares	213,585,003	213,585,003													213,585,003	0

Convertible Redeemable Preferred Shares (Detail Textuals) $ / shares in Units, ¥ in Thousands, $ in Thousands	1 Months Ended													12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares	Nov. 30, 2017 USD ($) $ / shares shares	Jul. 31, 2017 USD ($) $ / shares shares	Apr. 30, 2017 USD ($) $ / shares shares	Mar. 31, 2017 USD ($) $ / shares shares	Feb. 28, 2017 USD ($) $ / shares shares	Sep. 30, 2016 USD ($) $ / shares shares	Aug. 31, 2016 USD ($) $ / shares shares	Jul. 31, 2016 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) $ / shares shares	Sep. 30, 2015 USD ($) $ / shares shares	May 31, 2015 USD ($) $ / shares shares	Mar. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2018 $ / shares shares	Dec. 31, 2017 CNY (¥) shares	Dec. 31, 2016 CNY (¥) shares
Temporary Equity [Line Items]
Issuance of preferred shares (in shares)														7,509,933	392,513,479	102,144,675
Issuance of preferred shares \| ¥															¥ 11,952,766	¥ 1,862,134
Series A-1
Temporary Equity [Line Items]
Issuance of preferred shares (in shares)													165,000,000
Convertible redeemable preferred shares, per share \| $ / shares													$ 1.00
Issuance of preferred shares \| $													$ 165,000
Series A-2
Temporary Equity [Line Items]
Issuance of preferred shares (in shares)												130,000,000	130,000,000
Convertible redeemable preferred shares, per share \| $ / shares												$ 1.00	$ 1.00
Issuance of preferred shares \| $												$ 130,000	$ 130,000
Series A-3
Temporary Equity [Line Items]
Issuance of preferred shares (in shares)											24,210,431			7,509,933
Convertible redeemable preferred shares, per share \| $ / shares	$ 0.00025										$ 1.6522			$ 0.00025
Issuance of preferred shares											$ 40,000				¥ 0
Series B
Temporary Equity [Line Items]
Issuance of preferred shares (in shares)						114,867,321	114,867,321	114,867,321	114,867,321	114,867,321					12,722,646	102,144,675
Convertible redeemable preferred shares, per share \| $ / shares	0.00025					$ 2.751	$ 2.751	$ 2.751	$ 2.751	$ 2.751				0.00025
Issuance of preferred shares						$ 316,000	$ 316,000	$ 316,000	$ 316,000	$ 316,000					¥ 240,066	¥ 1,862,134
Series C
Temporary Equity [Line Items]
Issuance of preferred shares (in shares)			166,205,830	166,205,830	166,205,830										166,205,830
Convertible redeemable preferred shares, per share \| $ / shares	$ 0.00025		$ 3.885	$ 3.885	$ 3.885									0.00025
Issuance of preferred shares			$ 645,709	$ 645,709	$ 645,709										¥ 4,398,313
Series D
Temporary Equity [Line Items]
Issuance of preferred shares (in shares)	211,156,415	211,156,415													213,585,003
Convertible redeemable preferred shares, per share \| $ / shares	$ 0.00025	$ 5.353												$ 0.00025
Issuance of preferred shares	$ 1,130,320	$ 1,130,320													¥ 7,314,387

Convertible Redeemable Preferred Shares (Detail Textuals 1) ¥ in Thousands, $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($) shares	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)
Temporary Equity [Line Items]
Voting rights		Holders of the Preferred Shares are entitled to appoint a total of 10 out of 11 directors of the Board	Holders of the Preferred Shares are entitled to appoint a total of 10 out of 11 directors of the Board
Series A-1 convertible redeemable preferred shares
Temporary Equity [Line Items]
Stock issuance cost		¥ 1,892	$ 301
Series A-2 convertible redeemable preferred shares
Temporary Equity [Line Items]
Stock issuance cost		1,177	189
Series A-3 convertible redeemable preferred shares
Temporary Equity [Line Items]
Stock issuance cost		1,296	208
Series B convertible redeemable preferred shares
Temporary Equity [Line Items]
Stock issuance cost		11,857	1,782
Series C convertible redeemable preferred shares
Temporary Equity [Line Items]
Stock issuance cost		10,039	1,489
Series D convertible redeemable preferred shares
Temporary Equity [Line Items]
Unpaid value from total consideration	$ 12,000
Commission incurred	$ 26,000
Percentage of commission paid in cash	50.00%
Value of commission paid in cash	$ 13,000
Percentage of commission paid in shares	50.00%
Issuance of shares to pay commission \| shares	2,428,588
Stock issuance cost		¥ 6,033	$ 901

Convertible Redeemable Preferred Shares (Detail Textuals 2)	12 Months Ended
	Dec. 31, 2018
Series D
Temporary Equity [Line Items]
Percentage of dividend received	5.00%
Series C
Temporary Equity [Line Items]
Percentage of dividend received	5.00%
Series B
Temporary Equity [Line Items]
Percentage of dividend received	5.00%
Series A
Temporary Equity [Line Items]
Percentage of dividend received	5.00%

Convertible Redeemable Preferred Shares (Detail Textuals 3) - CNY (¥) ¥ in Thousands		12 Months Ended
	Sep. 14, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Temporary Equity [Line Items]
Holders entitled to receive amount per share		(A) an amount equal to the higher of (1) 100% of the original issue price of such Preferred Shares
Preferred stock, initial conversion ratio		The initial conversion ratio of Preferred Shares to ordinary shares shall be 1:1
Preferred stock, reason when security is redeemable		a) December 31, 2021, if no QIPO or Approved Sale has been consummated prior to such date, (b) any material change in applicable law that would prohibit or otherwise make it illegal to continue to operate the business under the then-existing equity structure of the Group, which could not be solved by alteration or adjustment of the equity structure of the Group after good faith consultation among the Company and its shareholders, (c) the early termination of employment or service contracts of no less than 30% of the certain key employees (or subsequent persons holding their respective positions) with the Group during any six-month period (excluding any early termination with cause) which has resulted in material adverse effect with respect to the Business of the Group as a whole, and (d) termination or disruption of the business of the Group as a whole, which is attributable to any Group Company’s non-compliance with applicable laws or breach or early termination of material business contracts or business arrangements with any supplier, clients or otherwise (any matter or event as described in items (a) to (d), hereinafter a “Redemption Event”), or (e) any other Preferred Share holder has requested the Company to redeem its shares in any Redemption Event by delivery of a notice.
Preferred stock, redemption terms		(a) 100% of the Preferred Shares’ original issue price, plus all accrued but unpaid dividends thereon up to the date of redemption and compound interest on the preferred shares’ original issue price at the rate of 8% per annum, proportionally adjusted for share subdivisions, share dividends, reorganizations, reclassifications, consolidations, mergers or similar transactions, and (b) the fair market value of such Preferred Shares at the date of redemption.
Percentage of Preferred Shares' original issue price as redemption amount payable equal to the greater of		100.00%
Compound interest rate on preferred shares' original issue price		8.00%
Accretion on convertible redeemable preferred shares to redemption value		¥ 13,667,291	¥ 2,576,935	¥ 981,233
Initial public offering (the "IPO")
Temporary Equity [Line Items]
Number of preferred shares automatically converted to ordinary shares	821,378,518

Redeemable non-controlling interests (Detail Textuals) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018
Temporary Equity [Line Items]
Percentage of simple interest on original issue price considered in redemption price	10.00%
XPT (Jiangsu) Automotive Technology Co., Ltd. ("XPT Auto")
Temporary Equity [Line Items]
Amount of total redeemable preferred share		¥ 1,269,900
Amount of consideration paid under redeemable preferred share	¥ 1,265,900
Amount of outstanding consideration paid under redeemable preferred share	¥ 4,000

Ordinary Shares (Detail Textuals) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Ordinary shares, par value (in dollars per share)	$ 0.00025	$ 0.00025
Share capital, value authorized	$ 1,000	$ 500
Share capital, shares authorized	4,000,000,000	2,000,000,000
Ordinary shares, shares authorized	1,219,469,778	1,151,269,325
Ordinary shares, shares issued		36,727,350
Ordinary shares, shares outstanding		23,850,343
Ordinary Shares
Class of Stock [Line Items]
Shares issued	1,057,731,012	36,727,350	32,003,810	28,900,001
Shares outstanding	1,050,799,032	23,850,343
Series A-1
Class of Stock [Line Items]
Preferred stock, shares authorized		165,000,000
Preferred stock, par value (in dollars per share)		$ 0.00025
Series A-2
Class of Stock [Line Items]
Preferred stock, shares authorized		130,000,000
Preferred stock, par value (in dollars per share)		$ 0.00025
Series A-3
Class of Stock [Line Items]
Preferred stock, shares authorized		31,720,364
Preferred stock, par value (in dollars per share)		$ 0.00025
Series B
Class of Stock [Line Items]
Preferred stock, shares authorized		114,867,321
Preferred stock, par value (in dollars per share)		$ 0.00025
Series C
Class of Stock [Line Items]
Preferred stock, shares authorized		167,142,990
Preferred stock, par value (in dollars per share)		$ 0.00025
Series D
Class of Stock [Line Items]
Preferred stock, shares authorized		240,000,000
Preferred stock, par value (in dollars per share)		$ 0.00025
Class A Ordinary Shares
Class of Stock [Line Items]
Ordinary shares, par value (in dollars per share)	$ 0.00025	$ 0.00025
Ordinary shares, shares authorized	2,500,000,000
Ordinary shares, shares issued	777,200,790
Ordinary shares, shares outstanding	770,268,810
Class B Ordinary Shares
Class of Stock [Line Items]
Ordinary shares, par value (in dollars per share)	$ 0.00025	$ 0.00025
Ordinary shares, shares authorized	132,030,222
Ordinary shares, shares issued	132,030,222
Ordinary shares, shares outstanding	132,030,222
Class C Ordinary Shares
Class of Stock [Line Items]
Ordinary shares, par value (in dollars per share)	$ 0.00025	$ 0.00025
Ordinary shares, shares authorized	148,500,000
Ordinary shares, shares issued	148,500,000
Ordinary shares, shares outstanding	148,500,000

Share-based Compensation (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total	¥ 679,468	$ 98,825	¥ 90,296	¥ 76,684
Cost of sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total	9,289		0	14,484
Research and development expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total	109,124		23,210	62,200
Selling, general and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total	¥ 561,055		¥ 67,086	¥ 0

Share-based Compensation (Details 1) - $ / shares	12 Months Ended
Share-based Compensation (Details 1) - $ / shares	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Number of Shares Outstanding
Granted	77,918,466	27,495,737
Restricted shares \| Employees \| Prime Hubs Restricted Shares Plan (the "Prime Hubs Plan")
Number of Shares Outstanding
Unvested, Beginning Balance	7,058,338	8,400,000	13,450,000
Granted		2,000,000
Vested	(7,058,338)	(3,133,329)	(3,362,500)
Forfeited		(208,333)	(1,687,500)
Unvested, Ending Balance	0	7,058,338	8,400,000
Weighted Average Grant Date Fair Value
Unvested, Beginning Balance	$ 1.04	$ 0.72	$ 0.72
Granted		2.05
Vested	1.04	0.84	0.72
Forfeited		0.72	0.72
Unvested, Ending Balance	$ 0.00	$ 1.04	$ 0.72
Restricted shares \| Non Employees \| Prime Hubs Restricted Shares Plan (the "Prime Hubs Plan")
Number of Shares Outstanding
Unvested, Beginning Balance	0	0	2,950,000
Vested			(2,950,000)
Unvested, Ending Balance	0	0	0
Weighted Average Grant Date Fair Value
Unvested, Beginning Balance	$ 0.00	$ 0.00	$ 1.25
Vested			1.25
Unvested, Ending Balance	$ 0.00	$ 0.00	$ 0.00

Share-based Compensation (Details 2) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Number of Options Outstanding
Granted	77,918,466	27,495,737
Share Options \| NIO Incentive Plans
Number of Options Outstanding
Outstanding, Beginning Balance	57,775,914	52,623,554	0
Granted	47,216,792	13,460,477	53,576,606
Exercised	(7,732,317)	(2,723,540)
Forfeited	(5,498,453)	(5,236,562)	(945,346)
Expired	(687,796)	(348,015)	(7,706)
Outstanding, Ending Balance	91,074,140	57,775,914	52,623,554
Vested and expected to vest	99,702,386	55,832,678	50,782,627
Exercisable	32,959,964	5,089,894	1,297,535
Weighted Average Exercise Price
Outstanding, Beginning Balance	$ 0.57	$ 0.32	$ 0.00
Granted	2.79	1.46	0.32
Exercised	0.40	0.39
Forfeited	1.17	0.44	0.39
Expired	0.62	0.25	0.10
Outstanding, Ending Balance	$ 1.69	$ 0.57	$ 0.32
Weighted Average Remaining Contractual Life, Outstanding	8 years 2 months 23 days	8 years 6 months 7 days	8 years 3 months 18 days
Aggregate Intrinsic Value, Outstanding	$ 425,988	$ 114,299	$ 51,506
Aggregate Intrinsic Value, Vested and expected to vest	467,127	107,299	49,245
Aggregate Intrinsic Value, Exercisable	$ 185,787	$ 11,070	$ 1,336

Share-based Compensation (Details 3) - Share Options - NIO Incentive Plans - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of the ordinary shares on the date of option grant (USD)	$ 1.93	$ 1.21	$ 0.90
Expected term (in years)		10 years	10 years
Expected dividend yield	0.00%	0.00%	0.00%
Expected volatility			54.00%
Expected forfeiture rate (post-vesting)		5.00%	5.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (USD)	$ 0.10	$ 0.61	$ 0.10
Fair value of the ordinary shares on the date of option grant (USD)	$ 3.38	$ 1.30	$ 0.96
Risk-free interest rate	2.74%	2.31%	1.46%
Expected term (in years)	7 years
Expected volatility	47.00%	51.00%
Expected forfeiture rate (post-vesting)	5.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (USD)	$ 6.74	$ 2.55	$ 0.61
Fair value of the ordinary shares on the date of option grant (USD)	$ 6.74	$ 2.55	$ 1.30
Risk-free interest rate	3.15%	2.40%	1.78%
Expected term (in years)	10 years
Expected volatility	51.00%	52.00%
Expected forfeiture rate (post-vesting)	8.00%

Share-based Compensation (Details 4) - Restricted shares - NIO Incentive Plans - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
US employees under 2015 plan
Number of Restricted Shares Outstanding
Unvested, Beginning Balance	1,112,977	1,837,387	0
Granted			3,103,809
Vested	(608,406)	(470,015)	(960,958)
Forfeited	(63,058)	(254,395)	(305,464)
Unvested, Ending Balance	441,513	1,112,977	1,837,387
Weighted Average Grant Date Fair Value
Unvested, Beginning Balance	$ 0.96	$ 0.96	$ 0.00
Granted			0.96
Vested	0.96	0.96	0.96
Forfeited	0.96	0.96	0.96
Unvested, Ending Balance	$ 0.96	$ 0.96	$ 0.96
Non-US employees under 2016 and 2017 plan
Number of Restricted Shares Outstanding
Unvested, Beginning Balance	0
Granted	509,001
Vested	(445,104)
Unvested, Ending Balance	63,897	0
Weighted Average Grant Date Fair Value
Unvested, Beginning Balance	$ 0.00
Granted	6.72
Vested	6.74
Unvested, Ending Balance	$ 6.60	$ 0.00

Share-based Compensation (Details 5) - Series A-3 convertible redeemable preferred shares - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price	$ 1.74	$ 1.82	$ 1.83
Fair value of the Preferred Shares on the measurement date	$ 4.54	$ 2.70	$ 1.80
Risk-free interest rate	2.00%	2.00%	2.00%
Remaining life (in years)	3 months 4 days	3 years 7 months 21 days	4 years 9 months
Expected dividend yield	0.00%	0.00%	0.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	43.00%	47.00%	47.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	44.00%	48.00%	51.00%

Share-based Compensation (Detail Textuals) - Restricted shares - Prime Hubs Restricted Shares Plan (the "Prime Hubs Plan") ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015	Dec. 31, 2018 USD ($)	Aug. 31, 2018 CNY (¥) shares	Dec. 31, 2017 USD ($)	Jan. 31, 2017 CNY (¥) shares
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service period				4 years
Percentage of vesting				25.00%
Recognized share-based compensation expenses	¥ 39,560	¥ 20,572	¥ 8,435
Unrecognized share-based compensation expenses \| $							$ 37,651
Weighted-average period for unrecognized expenses expected to be recognized	0 years	1 year 8 months 9 days
Non Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service period				1 year
Percentage of vesting				100.00%
Number of shares to be repurchased \| shares								250,000
Value of shares to be repurchased								¥ 1,686
Recognized share-based compensation expenses			¥ 24,532
Former employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares to be repurchased \| shares						562,500
Value of shares to be repurchased						¥ 7,490

Share-based Compensation (Detail Textuals 1) - NIO Incentive Plans ¥ in Thousands	12 Months Ended
	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 CNY (¥) $ / shares	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 CNY (¥) $ / shares	Dec. 31, 2016 CNY (¥)	Dec. 31, 2016 $ / shares	Dec. 31, 2015
Share Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value for options granted \| $ / shares		$ 1.93		$ 1.21		$ 0.90
Recognized share-based compensation expenses	¥ 437,320		¥ 30,127		¥ 17,998
Share Options \| Employees of NIO US
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expenses	¥ 17,101	$ 17,101	¥ 58,444	$ 58,444
Weighted-average period for unrecognized expenses expected to be recognized	2 years 8 months 1 day		2 years 6 months 11 days
Share Options \| Non NIO US employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expenses	¥ 50,279	50,279	¥ 275,473	275,473
Weighted-average period for unrecognized expenses expected to be recognized			3 years 7 days
IPO Performance Stock Option \| Non NIO US employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expenses			¥ 138,884	138,884
Restricted shares \| Employees of NIO US
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expenses	3,790		4,151		6,137
Unrecognized share-based compensation expenses	¥ 2,812	2,812	¥ 6,095	$ 6,095
Weighted-average period for unrecognized expenses expected to be recognized	9 months		1 year 9 months
Restricted shares \| Non NIO US employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expenses	¥ 20,323
Unrecognized share-based compensation expenses	¥ 2,798	$ 2,798
Weighted-average period for unrecognized expenses expected to be recognized	1 year 8 months 12 days
Share options and Restricted shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of plan							10 years
Vesting period							4 years
Share options and Restricted shares \| Vest upon first anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Description of award vesting rights							one fourth (1/4)
Share options and Restricted shares \| Vest rateably
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							36 months

Share-based Compensation (Detail Textuals 2) $ / shares in Units, ¥ in Thousands, $ in Thousands		1 Months Ended		12 Months Ended
	Mar. 10, 2016	Jun. 30, 2018 CNY (¥)	Nov. 30, 2015 USD ($) Management_Member $ / shares shares	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expenses				¥ 178,475	¥ 35,446	¥ 19,582
Series A-3 convertible redeemable preferred shares \| Key management team member
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of key management team member \| Management_Member			1
Number of shares issued \| shares			7,509,933
Price of per shares issued \| $ / shares			$ 1.6522
Value of loan provided \| $			$ 12,408
Interest rate of loan provided			1.80%
Frequency of interest rate compounding			semiannually
Requisite period of service	3 years
Percentage of vesting immediately	25.00%
Percentage of vesting annually	25.00%
Percentage of loan principal and interest	50.00%
Repayment of loan and interest accrued		¥ 82,863
Vesting percentage considered as exercised		75.00%
Percentage of unvested		25.00%

Taxation (Details)	12 Months Ended
Taxation (Details)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
United States
Income Tax [Line Items]
Maximum applicable income tax rate	29.84%	42.84%	42.84%
United Kingdom
Income Tax [Line Items]
Maximum applicable income tax rate	19.00%	19.25%	20.00%
Germany
Income Tax [Line Items]
Maximum applicable income tax rate	32.98%	32.98%	32.98%

Taxation (Details 1) - CNY (¥) ¥ in Thousands	12 Months Ended
Taxation (Details 1) - CNY (¥) ¥ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Current income tax expense	¥ 22,044	¥ 7,906	¥ 4,314

Taxation (Details 2) ¥ in Thousands, $ in Thousands	12 Months Ended
Taxation (Details 2) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Income Tax Disclosure [Abstract]
Loss before income tax expense	¥ (9,616,935)	$ (1,398,726)	¥ (5,013,268)	¥ (2,568,940)
Income tax expense computed at PRC statutory income tax rate of 25%	(2,404,234)		(1,253,318)	(642,235)
Non-deductible expenses	96,684		91,093	91,915
Foreign tax rates differential	167,180		(74,531)	52,495
Additional 50% tax deduction for qualified research and development expenses	(216,993)		(93,513)	(46,527)
Tax exempted interest income	(10,377)		(845)	(52)
Effect of U.S. tax law change	0		165,898	0
US tax credits	(42,781)		(52,185)	(5,716)
Prior year adjustments	(1,422)		(10,293)	3,594
Tax benefit not utilized	2,433,987		1,235,600	550,840
Current income tax expense	¥ 22,044	$ 3,206	¥ 7,906	¥ 4,314

Taxation (Details 3) - CNY (¥) ¥ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets
Net operating loss carry-forwards	¥ 3,777,696	¥ 1,620,535	¥ 567,844
Accrued and prepaid expenses	255,240	84,320	39,174
Advertising expenses in excess of deduction limit	14,234	65,737	9,118
Tax credit carry-forwards	107,471	60,624	13,735
Property, plant and equipment, net	12,349	27,463	28,849
Deferred rent	36,729	8,699	9,478
Deferred Revenue	83,877	0	2,411
Unrealized financing cost	41,939	0	0
Intangible assets	15,984	7,104	1,643
Share-based compensation	8,962	4,106	637
Unrealized foreign exchange loss	55	55	0
Total deferred tax assets	4,369,687	1,878,643	672,889
Less: Valuation allowance	(4,369,687)	(1,878,643)	(672,889)	¥ 0
Total deferred tax assets, net	¥ 0	¥ 0	¥ 0

Taxation (Details 4) - CNY (¥) ¥ in Thousands	12 Months Ended
Taxation (Details 4) - CNY (¥) ¥ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Valuation allowance
Balance at beginning of the year	¥ 1,878,643	¥ 672,889	¥ 0
Additions	2,491,044	1,205,754	672,889
Balance at end of the year	¥ 4,369,687	¥ 1,878,643	¥ 672,889

Taxation (Details 5) ¥ in Thousands	Dec. 31, 2018 CNY (¥)
Operating Loss Carryforwards [Line Items]
Total	¥ 11,551,510
Loss expiring in 2019
Operating Loss Carryforwards [Line Items]
Total	4
Loss expiring in 2020
Operating Loss Carryforwards [Line Items]
Total	186,827
Loss expiring in 2021
Operating Loss Carryforwards [Line Items]
Total	1,335,168
Loss expiring in 2022
Operating Loss Carryforwards [Line Items]
Total	3,098,425
Loss expiring in 2023
Operating Loss Carryforwards [Line Items]
Total	¥ 6,931,086

Taxation (Detail Textuals) ¥ in Thousands	12 Months Ended
Taxation (Detail Textuals) ¥ in Thousands	Dec. 31, 2018 CNY (¥)
Income Tax [Line Items]
Operating loss carryforwards	¥ 11,551,510
Tax Year 2017
Income Tax [Line Items]
Statutory income tax rate	35.00%
Tax Year 2018
Income Tax [Line Items]
Statutory income tax rate	21.00%
Loss expiring in 2019
Income Tax [Line Items]
Operating loss carryforwards	¥ 4
Loss expiring in 2020
Income Tax [Line Items]
Operating loss carryforwards	¥ 186,827
China \| State Administration of Taxation, China
Income Tax [Line Items]
Effective income tax rate	25.00%
Percentage of withholding tax for foreign investors non resident enterprises	10.00%
Percentage of withholding tax for resident enterprise	5.00%
Percent entitled to claim for qualified research and development expenses	175.00%
Additional percentage of qualified research and development expenses claimed in annual filing	75.00%
Statutory income tax rate	25.00%
United Kingdom
Income Tax [Line Items]
Operating loss carryforwards	¥ 1,221,492
Hong Kong
Income Tax [Line Items]
Operating loss carryforwards	¥ 1,221,492
Hong Kong \| Inland Revenue, Hong Kong
Income Tax [Line Items]
Effective income tax rate	16.50%
United States \| Loss expiring in 2017
Income Tax [Line Items]
Operating loss carryforwards	¥ 22,960
United States \| Loss expiring in 2018
Income Tax [Line Items]
Operating loss carryforwards	232,429
United States \| Loss expiring in 2019
Income Tax [Line Items]
Operating loss carryforwards	894,771
United States \| Loss expiring infinite years
Income Tax [Line Items]
Operating loss carryforwards	¥ 1,156,230

Loss Per Share (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 CNY (¥) ¥ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 CNY (¥) ¥ / shares shares	Dec. 31, 2016 CNY (¥) ¥ / shares shares
Numerator:
Net loss	¥ (9,638,979)	$ (1,401,932)	¥ (5,021,174)	¥ (2,573,254)
Accretion on convertible redeemable preferred shares to redemption value	(13,667,291)		(2,576,935)	(981,233)
Accretion on redeemable non-controlling interests to redemption value	(63,297)		0	0
Net loss attributable to non-controlling interests	41,705	6,066	36,440	36,938
Net loss attributable to ordinary shareholders of NIO Inc. for basic/dilutive net loss per share	¥ (23,327,862)	$ (3,392,897)	¥ (7,561,669)	¥ (3,517,549)
Denominator:
Weighted-average number of ordinary shares outstanding - basic and diluted \| shares	332,153,211	332,153,211	21,801,525	16,697,527
Basic and diluted net loss per share attributable to ordinary shareholders of NIO Inc. \| (per share)	¥ 70.23	$ 10.21	¥ 346.84	¥ 210.66

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 6: http://www.xbrl.org/2003/role/exampleRef
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+ Details

Loss Per Share (Detail Textuals) - shares	12 Months Ended
Loss Per Share (Detail Textuals) - shares	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Non-vested restricted shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average numbers of shares excluded from the calculation of diluted net loss per share	340,518	8,323,591	12,198,170
Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average numbers of shares excluded from the calculation of diluted net loss per share	72,735,288	27,495,737	26,311,777
Preferred Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average numbers of shares excluded from the calculation of diluted net loss per share	678,614,152	593,611,970	369,222,548

Related Party Balances and Transactions (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Service income	¥ 3,612	¥ 21,509	¥ 0
Shanghai NIO Hongling Investment Management Co., Ltd.
Related Party Transaction [Line Items]
Service income	2,707	0	0
Shanghai Weishang Business Consulting Co.,Ltd.
Related Party Transaction [Line Items]
Service income	905	0	0
Hubei Changjiang Nextev New Energy Investment Management Co., Ltd.
Related Party Transaction [Line Items]
Service income	0	11,121	0
Beijing CHJ Information Technology Co., Ltd.
Related Party Transaction [Line Items]
Service income	0	4,588	0
Hubei Changjiang Nextev New Energy Industry Development Capital Partnership (Limited Partnership)
Related Party Transaction [Line Items]
Service income	0	4,015	0
Jiangsu Xindian Automotive Co., Ltd.
Related Party Transaction [Line Items]
Service income	¥ 0	¥ 1,785	¥ 0

Related Party Balances and Transactions (Details 1) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Acceptance of marketing and advertising service	¥ 38,057	¥ 15,552	¥ 0
Beijing Xinyi Hudong Guanggao Co., Ltd.
Related Party Transaction [Line Items]
Acceptance of marketing and advertising service	28,245	8,021	0
Beijing Chehui Hudong Guanggao Co., Ltd.
Related Party Transaction [Line Items]
Acceptance of marketing and advertising service	6,915	544	0
Bite Shijie (Beijing) Keji Co., Ltd.
Related Party Transaction [Line Items]
Acceptance of marketing and advertising service	2,865	6,987	0
Beijing Bitauto Information Technology Co., Ltd.
Related Party Transaction [Line Items]
Acceptance of marketing and advertising service	¥ 32	¥ 0	¥ 0

Related Party Balances and Transactions (Details 2) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Loan to related party	¥ 66,166	¥ 50,000	¥ 0
NIO Capital
Related Party Transaction [Line Items]
Loan to related party	66,166	0	0
Ningbo Meishan Bonded Port Area Weilan Investment Co., Ltd.
Related Party Transaction [Line Items]
Loan to related party	¥ 0	¥ 50,000	¥ 0

Related Party Balances and Transactions (Details 3) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Suzhou Zenlead XPT New Energy Technologies Co., Ltd.
Related Party Transaction [Line Items]
Cost of manufacturing consignment	¥ 132,152	¥ 18,324	¥ 0

Related Party Balances and Transactions (Details 4) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Purchase of property and equipment	¥ 11,107	¥ 2,960	¥ 0
Kunshan Siwopu Intelligent Equipment Co., Ltd.
Related Party Transaction [Line Items]
Purchase of property and equipment	11,107	0	0
Bite Shijie (Beijing) Keji Co., Ltd.
Related Party Transaction [Line Items]
Purchase of property and equipment	¥ 0	¥ 2,960	¥ 0

Related Party Balances and Transactions (Details 5) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Baidu Capital L.P.
Related Party Transaction [Line Items]
Interest payable on behalf of related party	¥ 8,065	¥ 21,671	¥ 0

Related Party Balances and Transactions (Details 6) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Acceptance of R&D and maintenance service	¥ 17,212	¥ 0	¥ 0
Suzhou Zenlead XPT New Energy Technologies Co., Ltd.
Related Party Transaction [Line Items]
Acceptance of R&D and maintenance service	14,776	0	0
Kunshan Siwopu Intelligent Equipment Co., Ltd.
Related Party Transaction [Line Items]
Acceptance of R&D and maintenance service	¥ 2,436	¥ 0	¥ 0

Related Party Balances and Transactions (Details 7) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Nanjing Weibang Transmission Technology Co., Ltd
Related Party Transaction [Line Items]
Payment on behalf of related party	¥ 2,790	¥ 0	¥ 0

Related Party Balances and Transactions (Details 8) - CNY (¥) ¥ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Amounts due from related parties	¥ 96,036	¥ 79,556
Ningbo Meishan Bonded Port Area Weilan Investment Co., Ltd.
Related Party Transaction [Line Items]
Amounts due from related parties	50,000	50,000
NIO Capital
Related Party Transaction [Line Items]
Amounts due from related parties	34,316	0
Kunshan Siwopu Intelligent Equipment Co., Ltd.
Related Party Transaction [Line Items]
Amounts due from related parties	7,970	0
Nanjing Weibang Transmission Technology Co., Ltd.
Related Party Transaction [Line Items]
Amounts due from related parties	2,790	0
Shanghai Weilan Hongling Investment Management Co., Ltd.
Related Party Transaction [Line Items]
Amounts due from related parties	960	0
Baidu Capital L.P.
Related Party Transaction [Line Items]
Amounts due from related parties	0	21,671
Beijing CHJ Information Technology Co., Ltd.
Related Party Transaction [Line Items]
Amounts due from related parties	0	3,624
Bin Li
Related Party Transaction [Line Items]
Amounts due from related parties	0	1,680
Jiangsu Xindian Automotive Co., Ltd.
Related Party Transaction [Line Items]
Amounts due from related parties	0	1,627
Hubei Changjiang Nextev New Energy Investment Management Co., Ltd.
Related Party Transaction [Line Items]
Amounts due from related parties	¥ 0	¥ 954

Related Party Balances and Transactions (Details 9) - CNY (¥) ¥ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Amounts due to related parties	¥ 219,583	¥ 40,069
Suzhou Zenlead XPT New Energy Technologies Co., Ltd.
Related Party Transaction [Line Items]
Amounts due to related parties	210,868	19,466
Beijing Chehui Hudong Guanggao Co., Ltd.
Related Party Transaction [Line Items]
Amounts due to related parties	4,085	576
Beijing Xinyi Hudong Guanggao Co., Ltd.
Related Party Transaction [Line Items]
Amounts due to related parties	3,530	400
Kunshan Siwopu Intelligent Equipment Co., Ltd.
Related Party Transaction [Line Items]
Amounts due to related parties	761	0
Bite Shijie (Beijing) Keji Co., Ltd.
Related Party Transaction [Line Items]
Amounts due to related parties	339	0
Bin Li
Related Party Transaction [Line Items]
Amounts due to related parties	0	14,289
Lihong Qin
Related Party Transaction [Line Items]
Amounts due to related parties	¥ 0	¥ 5,338

Related Party Balances and Transactions (Detail Textuals) $ in Thousands	Jan. 12, 2019 Loan	Jan. 12, 2018 USD ($)
Related Party Transactions [Abstract]
Number of loan \| Loan	2
Principal amount \| $		$ 5,000

Commitments and Contingencies (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Property and equipment	¥ 1,454,031	¥ 1,250,612
Leasehold improvements	149,551	470,600
Total	¥ 1,603,582	¥ 1,721,212

Commitments and Contingencies (Details 1) - CNY (¥) ¥ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Within one year	¥ 393,734	¥ 233,486
1 to 2 years	457,892	261,846
2 to 3 years	444,909	278,278
More than 3 years	1,091,911	912,356
Total	¥ 2,388,446	¥ 1,685,966

Subsequent Events (Detail Textuals) - Subsequent event - 4.50% Convertible Senior Notes due 2024 (the "2024 Notes") $ in Thousands, ADSs in Millions	Feb. 04, 2019 USD ($)	Feb. 28, 2019 USD ($)	Feb. 15, 2019 USD ($)	Jan. 30, 2019 ADSs $ / ADS
Subsequent Event [Line Items]
Aggregate principal amount of notes	$ 650,000
Interest rate	4.50%
Term of notes	30 days
Additional debt, principal amount	$ 100,000	$ 48,227	$ 51,773
Cap price per ADS of capped call transaction \| $ / ADS				14.92
Number of agreegate american depository shares purchased \| ADSs				26.8

Parent Company Only Condensed Financial Information (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 CNY (¥)
Current assets:
Cash and cash equivalents	¥ 3,133,847	$ 455,799	¥ 7,505,954
Amounts due from related parties	88,066	12,809	29,556
Prepayments and other current assets	1,514,257	220,240	674,425
Total current assets	12,169,632	1,770,000	8,310,005
Non-current assets:
Total non-current assets	6,672,920	970,536	2,158,029
Total assets	18,842,552	2,740,536	10,468,034
Current liabilities:
Amounts due to related parties	219,583	31,937	40,069
Accruals and other liabilities	308,486		199,087
Total current liabilities	8,593,386	1,249,856	1,618,514
Deferred revenues	301,774		0			$ 0
Total non-current liabilities	2,098,824	305,262	783,514
Total liabilities	10,692,210	1,555,118	2,402,028
MEZZANINE EQUITY
Total mezzanine equity	0	193,324	19,657,786		¥ 4,861,574		¥ 1,616,729
SHAREHOLDERS' (DEFICIT)/EQUITY
Ordinary shares			60
Treasury shares	(9,186)	(1,336)	(9,186)
Additional paid in capital	41,918,936	6,096,856	131,907
Accumulated other comprehensive income/(loss)	(34,708)	(5,048)	(13,922)
Accumulated deficit	(35,039,810)	(5,096,329)	(11,711,948)
Total shareholders' deficit	6,821,145	992,094	(11,591,780)		(3,916,360)		(499,828)
Liabilities And Stockholders Equity	18,842,552	2,740,536	10,468,034
Parent
Current assets:
Cash and cash equivalents	17,179	2,499	23,270	$ 3,384	79,691		264,344
Amounts due from related parties	20,701	3,011	1,243,251
Prepayments and other current assets	54,847	7,977	1,642
Total current assets	92,727	13,487	1,268,163
Non-current assets:
Investments in subsidiaries and VIEs	8,891,882	1,293,271	6,977,051
Total non-current assets	8,891,882	1,293,271	6,977,051
Total assets	8,984,609	1,306,758	8,245,214
Current liabilities:
Amounts due to related parties	2,046,971	297,720	135,490
Accruals and other liabilities	913	134	55,027
Total current liabilities	2,047,884	297,854	190,517
Deferred revenues	99,684	14,498	0
Total non-current liabilities	99,684	14,498	0
Total liabilities	2,147,568	312,352	190,517
MEZZANINE EQUITY
Total mezzanine equity	0	0	19,657,786
SHAREHOLDERS' (DEFICIT)/EQUITY
Ordinary shares	0	0	60
Treasury shares	(9,186)	(1,336)	(9,186)
Additional paid in capital	41,918,936	6,096,856	131,907
Accumulated other comprehensive income/(loss)	(34,708)	(5,048)	(13,922)
Accumulated deficit	(35,039,810)	(5,096,329)	(11,711,948)
Total shareholders' deficit	6,837,041	994,406	(11,603,089)
Liabilities And Stockholders Equity	8,984,609	1,306,758	8,245,214
Series A-1 and A-2 convertible redeemable preferred shares
MEZZANINE EQUITY
Total mezzanine equity	0		5,011,731		2,539,993		1,340,034
Series A-1 and A-2 convertible redeemable preferred shares \| Parent
MEZZANINE EQUITY
Total mezzanine equity	0	0	5,011,731
Series A-3 convertible redeemable preferred shares
MEZZANINE EQUITY
Total mezzanine equity	0		427,129		306,678		276,695
Series A-3 convertible redeemable preferred shares \| Parent
MEZZANINE EQUITY
Total mezzanine equity	0	0	427,129
Series B convertible redeemable preferred shares
MEZZANINE EQUITY
Total mezzanine equity	0		2,294,980		2,014,903		0
Series B convertible redeemable preferred shares \| Parent
MEZZANINE EQUITY
Total mezzanine equity	0	0	2,294,980
Series C convertible redeemable preferred shares
MEZZANINE EQUITY
Total mezzanine equity	0		4,454,596		0		0
Series C convertible redeemable preferred shares \| Parent
MEZZANINE EQUITY
Total mezzanine equity	0	0	4,454,596
Series D convertible redeemable preferred shares
MEZZANINE EQUITY
Receivable from a holder			78,410
Total mezzanine equity	0		7,469,350		¥ 0		¥ 0
Series D convertible redeemable preferred shares \| Parent
MEZZANINE EQUITY
Receivable from a holder	0	0	(78,410)
Total mezzanine equity	0	0	7,547,760
Class A Ordinary Shares
SHAREHOLDERS' (DEFICIT)/EQUITY
Ordinary shares	1,329	193
Class A Ordinary Shares \| Parent
SHAREHOLDERS' (DEFICIT)/EQUITY
Ordinary shares	1,329	193	0
Class B Ordinary Shares
SHAREHOLDERS' (DEFICIT)/EQUITY
Ordinary shares	226	33
Class B Ordinary Shares \| Parent
SHAREHOLDERS' (DEFICIT)/EQUITY
Ordinary shares	226	33	0
Class C Ordinary Shares
SHAREHOLDERS' (DEFICIT)/EQUITY
Ordinary shares	254	37
Class C Ordinary Shares \| Parent
SHAREHOLDERS' (DEFICIT)/EQUITY
Ordinary shares	¥ 254	$ 37	¥ 0

Parent Company Only Condensed Financial Information (Details 1) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Operating expenses:
Selling, general and administrative	¥ (5,341,790)	$ (776,931)	¥ (2,350,707)	¥ (1,137,187)
Total operating expenses	9,339,732	1,358,408	4,953,596	2,602,540
Loss from operations	9,595,608	1,395,624	4,953,596	2,602,540
Interest income	133,384	19,400	18,970	27,556
Interest expenses	(123,643)	(17,983)	(18,084)	(55)
Investment income			3,498	2,670
Other income/(loss), net	(21,346)	(3,105)	(58,681)	3,429
Loss before income tax expense	(9,616,935)	(1,398,726)	(5,013,268)	(2,568,940)
Income tax expense	22,044	3,206	7,906	4,314
Net loss	(9,638,979)	(1,401,932)	(5,021,174)	(2,573,254)
Accretion on redeemable non-controlling interests to redemption value	(63,297)	(9,206)
Net loss attributable to ordinary shareholders of NIO Inc.	23,327,862	3,392,897	7,561,669	3,517,549
Parent
Operating expenses:
Selling, general and administrative	(178,479)	(25,959)	(52,518)	(24,684)
Total operating expenses	(178,479)	(25,959)	(52,518)	(24,684)
Loss from operations	(178,479)	(25,959)	(52,518)	(24,684)
Interest income	7,692	1,119	2,391	24,309
Interest expenses	0	0	(12,389)	0
Equity in loss of subsidiaries and VIEs	(9,432,640)	(1,371,921)	(4,924,897)	(2,539,323)
Investment income	0	0	3,498	2,670
Other income/(loss), net	6,153	895	(819)	712
Loss before income tax expense	(9,597,274)	(1,395,866)	(4,984,734)	(2,536,316)
Income tax expense	0	0	0	0
Net loss	(9,597,274)	(1,395,866)	(4,984,734)	(2,536,316)
Accretion on redeemable non-controlling interests to redemption value	(13,667,291)	(1,987,825)	(2,576,935)	(981,233)
Accretion on redeemable non-controlling interests to redemption value	(63,297)	(9,206)	0	0
Net loss attributable to ordinary shareholders of NIO Inc.	¥ (23,327,862)	$ (3,392,897)	¥ (7,561,669)	¥ (3,517,549)

Parent Company Only Condensed Financial Information (Details 2) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
CASH FLOWS FROM OPERATING ACTIVITIES
Net cash used in operating activities	¥ (7,911,768)	$ (1,150,719)	¥ (4,574,719)	¥ (2,201,564)
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of trading securities			1,340,911	3,118,559
Purchase of held for trading securities			(1,337,413)	(2,346,261)
Acquisitions of equity investees	(110,900)	(16,130)	(52,500)
Net cash used in investing activities	(7,940,843)	(1,154,949)	(1,190,273)	117,843
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of stock options	42,251	6,145	6,207
Proceeds from issuance of convertible promissory note			312,624
Repayment of convertible promissory note			325,013
Repayment of non-recourse loan	82,863	12,052
Proceeds from issuance of ordinary shares, net of issuance costs	7,531,037	1,095,344
Net cash provided by financing activities	11,603,092	1,687,601	12,867,334	2,292,704
Effects of exchange rate changes on cash and cash equivalents	(56,947)	(8,282)	(168,120)
NET INCREASE IN CASH AND CASH EQUIVALENTS	(4,306,466)	(626,349)	6,934,222
Cash and cash equivalents at beginning of the year	7,505,954
Cash and cash equivalents at end of the year	3,133,847	455,799	7,505,954
Parent
CASH FLOWS FROM OPERATING ACTIVITIES
Net cash used in operating activities	3,917,654	569,799	(4,920,905)	(2,540,639)
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of trading securities	0	0	1,340,911	3,118,559
Purchase of held for trading securities	0	0	(1,337,413)	(2,346,261)
Acquisitions of equity investees	(11,693,144)	(1,700,697)	(6,223,178)	(669,433)
Net cash used in investing activities	(11,693,144)	(1,700,697)	(6,219,680)	102,865
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of stock options	42,251	6,145	6,207	0
Repurchase of restricted shares	(7,490)	(1,089)	0	0
Proceeds from issuance of convertible promissory note	0	0	312,624	0
Repayment of convertible promissory note	0	0	325,013	0
Repayment of non-recourse loan	82,863	12,052	0	0
Proceeds from issuance of ordinary shares, net of issuance costs	7,566,470	1,100,497	0	0
Proceeds from issuance of convertible redeemable preferred shares, net of issuance costs	78,651	11,439	11,093,377	2,260,444
Net cash provided by financing activities	7,762,745	1,129,044	11,087,195	2,260,444
Effects of exchange rate changes on cash and cash equivalents	6,654	969	(3,031)	(7,323)
NET INCREASE IN CASH AND CASH EQUIVALENTS	(6,091)	(885)	(56,421)	(184,653)
Cash and cash equivalents at beginning of the year	23,270	3,384	79,691	264,344
Cash and cash equivalents at end of the year	¥ 17,179	$ 2,499	¥ 23,270	¥ 79,691