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
Net proceeds from sale of ordinary shares		108,180			108,180
Net proceeds from sale of ordinary shares (in shares)	7,705
Proceeds from ESPP purchases		2,862			2,862
Proceeds from ESPP purchases (in shares)	188
Employee share-based compensation expense		45,143			45,143
Issuance of restricted shares (in shares)	1,978
Option exercises		5			5
Repurchase of shares to satisfy tax withholding		(8,606)			(8,606)
Repurchase of shares to satisfy tax withholding (in shares)	(501)
Net unrealized gain (loss) on marketable securities			(33)		(33)
Net income (loss)				(167,392)	(167,392)
Balances at Sep. 30, 2021	$ 1	1,370,402	14	(1,694,009)	(323,592)
Balances (in shares) at Sep. 30, 2021	73,698
Balances at Jun. 30, 2021	$ 1	1,358,318	8	(1,658,701)	(300,374)
Balances (in shares) at Jun. 30, 2021	73,470
Increase (Decrease) in Stockholders' Equity
Employee share-based compensation expense		14,370			14,370
Issuance of restricted shares (in shares)	391
Repurchase of shares to satisfy tax withholding		(2,286)			(2,286)
Repurchase of shares to satisfy tax withholding (in shares)	(163)
Net unrealized gain (loss) on marketable securities			6		6
Net income (loss)				(35,308)	(35,308)
Balances at Sep. 30, 2021	$ 1	1,370,402	14	(1,694,009)	(323,592)
Balances (in shares) at Sep. 30, 2021	73,698
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
Repurchase of ordinary shares		(94,037)			$ (94,037)
Repurchase of ordinary shares (in shares)	(9,645)
Proceeds from ESPP purchases		488			488
Proceeds from ESPP purchases (in shares)	72
Employee share-based compensation expense		32,784			32,784
Issuance of restricted shares (in shares)	2,764
Repurchase of shares to satisfy tax withholding		(2,457)			(2,457)
Repurchase of shares to satisfy tax withholding (in shares)	(260)
Net unrealized gain (loss) on marketable securities			(121)		(121)
Net income (loss)				882,494	882,494
Balances at Sep. 30, 2022	$ 1	1,324,247	(121)	(843,549)	$ 480,578
Balances (in shares) at Sep. 30, 2022	67,366				67,366
Balances at Jun. 30, 2022	$ 1	1,410,415	(45)	(1,760,180)	$ (349,809)
Balances (in shares) at Jun. 30, 2022	76,427
Increase (Decrease) in Stockholders' Equity
Repurchase of ordinary shares		(94,037)			(94,037)
Repurchase of ordinary shares (in shares)	(9,645)
Proceeds from ESPP purchases		1			1
Employee share-based compensation expense		8,530			8,530
Issuance of restricted shares (in shares)	655
Repurchase of shares to satisfy tax withholding		(662)			(662)
Repurchase of shares to satisfy tax withholding (in shares)	(71)
Net unrealized gain (loss) on marketable securities			(76)		(76)
Net income (loss)				916,631	916,631
Balances at Sep. 30, 2022	$ 1	$ 1,324,247	$ (121)	$ (843,549)	$ 480,578
Balances (in shares) at Sep. 30, 2022	67,366				67,366