CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS DEFICIT - USD ($) shares in Thousands, $ in Thousands	Ordinary Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Total
Balances at Dec. 31, 2020	$ 1	$ 1,222,818	$ 47	$ (1,526,617)	$ (303,751)
Balances (in shares) at Dec. 31, 2020	64,328
Increase (Decrease) in Stockholders' Equity
Employee share-based compensation expense		15,832			15,832
Issuance of restricted shares (in shares)	1,188
Option exercises		3			3
Repurchase of shares to satisfy tax withholding		(5,593)			(5,593)
Repurchase of shares to satisfy tax withholding (in shares)	(298)
Net unrealized gain (loss) on marketable securities			(30)		(30)
Net loss				(79,679)	(79,679)
Balances at Mar. 31, 2021	$ 1	1,233,060	17	(1,606,296)	(373,218)
Balances (in shares) at Mar. 31, 2021	65,218
Balances at Dec. 31, 2021	$ 1	1,387,469		(1,726,043)	$ (338,573)
Balances (in shares) at Dec. 31, 2021	74,435				74,435
Increase (Decrease) in Stockholders' Equity
Employee share-based compensation expense		14,545			$ 14,545
Issuance of restricted shares (in shares)	1,796
Repurchase of shares to satisfy tax withholding		(1,448)			(1,448)
Repurchase of shares to satisfy tax withholding (in shares)	(150)
Net unrealized gain (loss) on marketable securities			(28)		(28)
Net loss				(25,946)	(25,946)
Balances at Mar. 31, 2022	$ 1	$ 1,400,566	$ (28)	$ (1,751,989)	$ (351,450)
Balances (in shares) at Mar. 31, 2022	76,081				76,081