Condensed Unaudited Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity / (Deficit) - USD ($) $ in Thousands		Total	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Redeemable Convertible Preferred Stock Preferred Stock	Series A Common Stock [Member] Common Stock	Series B common stock [Member] Common Stock	Class A Common Stock [Member]	Class A Common Stock [Member] Common Stock		Class B Common Stock [Member]	Class B Common Stock [Member] Common Stock
Balance at Dec. 31, 2020		$ (239,220)	$ 4,956	$ (242,254)	$ (2,037)	$ 154,210	$ 112	$ 3
Balance (in shares) at Dec. 31, 2020						39,223,194	112,012,693	3,054,318
Restricted stock cancelation			18				$ (18)
Restricted stock cancelation (in shares)							(17,853,416)
Shares issued in connection with certain agreements		5,454	5,453				$ 1
Shares issued in connection with certain agreements (in shares)							613,497
Restricted stock grants			(4)				$ 4
Restricted stock grants (in shares)							3,687,431
Restricted stock forfeitures			2				$ (2)
Restricted stock forfeitures (in shares)							(1,629,369)
Foreign currency translation adjustment		54			54
Net loss		(24,374)		(24,374)
Balance (in shares) at Mar. 31, 2021						39,223,194	96,830,836	3,054,318
Balance at Mar. 31, 2021		(258,086)	10,425	(266,628)	(1,983)	$ 154,210	$ 97	$ 3
Balance at Dec. 31, 2021	[1]	90,488	584,208	(491,817)	(2,101)					$ 160			$ 38
Balance (in shares) at Dec. 31, 2021									115,456,543	159,974,847	[1]	18,419,260	37,856,095	[1]
Shares issued in connection with certain agreements		11,083	11,082							$ 1
Shares issued in connection with certain agreements (in shares)										1,026,785
Restricted stock grants			(4)							$ 4
Restricted stock grants (in shares)										4,162,159
Restricted stock forfeitures			1							$ (1)
Restricted stock forfeitures (in shares)										(717,505)
Class B common stock transferred to Class A common stock										$ 1			$ (1)
Class B common stock transferred to Class A common stock (in shares)									73,813,713	1,000,000			(1,000,000)
Stock-based compensation		74,990	74,990
Options exercised		65	65
Options exercised (in shares)										15,500
Foreign currency translation adjustment		(244)			(244)
Net loss		(72,037)		(72,037)
Balance (in shares) at Mar. 31, 2022									117,498,828	165,461,786	[2]	17,419,260	36,856,095	[2]
Balance at Mar. 31, 2022	[2]	$ 104,345	$ 670,342	$ (563,854)	$ (2,345)					$ 165			$ 37

[1] Includes 115,456,543 outstanding Class A common stock, 18,419,260 outstanding Class B common stock, 44,518,304 unvested Class A restricted stock and 19,436,835 unvested Class B restricted stock.

[2] Includes 117,498,828 outstanding Class A common stock, 17,419,260 outstanding Class B common stock, 47,962,958 unvested Class A restricted stock and 19,436,835 unvested Class B restricted stock.