Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Class A and Class B Common Stock	Additional Paid-in Capital	Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjustment	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2020	$ 1,676,163		$ 3	$ 8,977,061		$ (7,300,428)		$ (473)
Beginning balance (in shares) at Dec. 31, 2020			323,737
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of stock options	3,244			3,244
Issuance of common stock upon exercise of stock options (in shares)			488
Issuance of common stock upon settlement of restricted stock units (in shares)			5,218
Shares withheld related to net share settlement	(7,653)			(7,653)
Shares withheld related to net share settlement (in shares)			(130)
Stock-based compensation	164,229			164,229
Other comprehensive (loss) income	218							218
Net loss	(427,339)					(427,339)
Ending balance at Mar. 31, 2021	1,408,862		$ 3	9,136,881		(7,727,767)		(255)
Ending balance (in shares) at Mar. 31, 2021			329,313
Beginning balance at Dec. 31, 2020	1,676,163		$ 3	8,977,061		(7,300,428)		(473)
Beginning balance (in shares) at Dec. 31, 2020			323,737
Ending balance at Dec. 31, 2021	$ 1,341,213	$ (133,470)	$ 3	9,706,293	$ (139,958)	(8,362,572)	$ 6,488	(2,511)
Ending balance (in shares) at Dec. 31, 2021			344,938
Increase (Decrease) in Stockholders' Equity
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2020-06 [Member]
Issuance of common stock upon exercise of stock options	$ 90			90
Issuance of common stock upon exercise of stock options (in shares)			65
Issuance of common stock upon settlement of restricted stock units (in shares)			3,602
Shares withheld related to net share settlement	(1,807)			(1,807)
Shares withheld related to net share settlement (in shares)			(44)
Stock-based compensation	156,595			156,595
Other comprehensive (loss) income	(7,701)							(7,701)
Net loss	(196,932)					(196,932)
Ending balance at Mar. 31, 2022	$ 1,157,988		$ 3	$ 9,721,213		$ (8,553,016)		$ (10,212)
Ending balance (in shares) at Mar. 31, 2022			348,561