Condensed Consolidated Statements of Temporary Equity and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Additional Paid-in Capital	Receivable For Warrant Exercises	Accumulated deficit	Series A Convertible Preferred Stock	Series B Convertible Preferred Stock	Founder Convertible Preferred Stock [Member]	Class A Common Stock	Class B Common Stock
Balance at Dec. 31, 2019	$ (17,143)	$ 756		$ (17,900)	$ 4,634	$ 6,386			$ 1
Balance, shares at Dec. 31, 2019					16,983,241	3,765,685	27,162,191	210,863	105,191,937
Stock-based compensation	18	18
Exercise of stock options and issuance of restricted stock unit awards, net of statutory tax withholdings	1	1
Exercise of stock options and issuance of restricted stock unit awards, net of statutory tax withholdings , shares								4,902
Net loss	(1,125)			(1,125)
Balance at Mar. 31, 2020	(18,249)	775		(19,025)	$ 4,634	$ 6,386			$ 1
Balance, shares at Mar. 31, 2020					16,983,241	3,765,685	27,162,191	215,765	105,191,937
Balance at Dec. 31, 2019	(17,143)	756		(17,900)	$ 4,634	$ 6,386			$ 1
Balance, shares at Dec. 31, 2019					16,983,241	3,765,685	27,162,191	210,863	105,191,937
Net loss	(2,941)
Balance at Jun. 30, 2020	(19,990)	849		(20,840)	$ 4,634	$ 6,386			$ 1
Balance, shares at Jun. 30, 2020					16,983,241	3,765,685	27,162,191	266,015	105,191,937
Balance at Mar. 31, 2020	(18,249)	775		(19,025)	$ 4,634	$ 6,386			$ 1
Balance, shares at Mar. 31, 2020					16,983,241	3,765,685	27,162,191	215,765	105,191,937
Stock-based compensation	52	52
Exercise of stock options and issuance of restricted stock unit awards, net of statutory tax withholdings	22	22
Exercise of stock options and issuance of restricted stock unit awards, net of statutory tax withholdings , shares								50,250,000
Net loss	(1,815)			(1,815)
Balance at Jun. 30, 2020	(19,990)	849		(20,840)	$ 4,634	$ 6,386			$ 1
Balance, shares at Jun. 30, 2020					16,983,241	3,765,685	27,162,191	266,015	105,191,937
Balance at Dec. 31, 2020	907,130	1,055,128	$ (96)	(147,904)				$ 1	$ 1
Balance, shares at Dec. 31, 2020								144,912,362	132,354,128
Stock-based compensation	817	817
Exercise of stock options and issuance of restricted stock unit awards, net of statutory tax withholdings	101	106	(5)
Exercise of stock options and issuance of restricted stock unit awards, net of statutory tax withholdings , shares								163,397
Exercise of warrants	341,113	341,400	(288)					$ 1
Exercise of warrants, shares								24,140,361
Shares surrendered upon exercise of warrants, shares								(8,008,697)
Net loss	(176,843)			(176,843)
Balance at Mar. 31, 2021	1,072,318	1,397,451	(389)	(324,747)				$ 2	$ 1
Balance, shares at Mar. 31, 2021								161,207,423	132,354,128
Balance at Dec. 31, 2020	$ 907,130	1,055,128	(96)	(147,904)				$ 1	$ 1
Balance, shares at Dec. 31, 2020								144,912,362	132,354,128
Exercise of stock options and issuance of restricted stock unit awards, net of statutory tax withholdings , shares	901,406
Net loss	$ (223,065)
Balance at Jun. 30, 2021	1,110,590	1,481,556		(370,969)				$ 2	$ 1
Balance, shares at Jun. 30, 2021								163,711,901	132,354,128
Balance at Mar. 31, 2021	1,072,318	1,397,451	(389)	(324,747)				$ 2	$ 1
Balance, shares at Mar. 31, 2021								161,207,423	132,354,128
Stock-based compensation	2,218	2,218
Exercise of stock options and issuance of restricted stock unit awards, net of statutory tax withholdings	(189)	(194)	5
Exercise of stock options and issuance of restricted stock unit awards, net of statutory tax withholdings , shares								827,622
Exercise of warrants	24,424	24,062	362
Exercise of warrants, shares								3,611,226
Shares surrendered upon exercise of warrants, shares								(1,934,370)
Stock issuance costs and redemption of unexercised warrants		(22)	$ 22
Vesting of Magna Warrants	58,041	58,041
Net loss	(46,222)			(46,222)
Balance at Jun. 30, 2021	$ 1,110,590	$ 1,481,556		$ (370,969)				$ 2	$ 1
Balance, shares at Jun. 30, 2021								163,711,901	132,354,128