CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (DEFICIT) - USD ($) shares in Thousands, $ in Thousands	Ordinary Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Gain (Loss)	Accumulated Deficit	Total
Balances at Dec. 31, 2021	$ 1	$ 1,387,469		$ (1,726,043)	$ (338,573)
Balances (in shares) at Dec. 31, 2021	74,435
Increase (Decrease) in Stockholders' Equity
Proceeds from ESPP purchases		487			487
Proceeds from ESPP purchases (in shares)	72
Employee share-based compensation expense		24,254			24,254
Issuance of restricted shares (in shares)	2,109
Repurchase of shares to satisfy tax withholding		(1,795)			(1,795)
Repurchase of shares to satisfy tax withholding (in shares)	(189)
Net unrealized loss on available-for-sale investments			$ (45)		(45)
Net loss				(34,137)	(34,137)
Balances at Jun. 30, 2022	$ 1	1,410,415	(45)	(1,760,180)	(349,809)
Balances (in shares) at Jun. 30, 2022	76,427
Balances at Mar. 31, 2022	$ 1	1,400,566	(28)	(1,751,989)	(351,450)
Balances (in shares) at Mar. 31, 2022	76,081
Increase (Decrease) in Stockholders' Equity
Proceeds from ESPP purchases		487			487
Proceeds from ESPP purchases (in shares)	72
Employee share-based compensation expense		9,709			9,709
Issuance of restricted shares (in shares)	313
Repurchase of shares to satisfy tax withholding		(347)			(347)
Repurchase of shares to satisfy tax withholding (in shares)	(39)
Net unrealized loss on available-for-sale investments			(17)		(17)
Net loss				(8,191)	(8,191)
Balances at Jun. 30, 2022	$ 1	1,410,415	(45)	(1,760,180)	(349,809)
Balances (in shares) at Jun. 30, 2022	76,427
Balances at Dec. 31, 2022	$ 1	1,295,725	(15)	(853,911)	$ 441,800
Balances (in shares) at Dec. 31, 2022	65,227				65,227
Increase (Decrease) in Stockholders' Equity
Repurchase of ordinary shares, net of transaction costs		(135,896)			$ (135,896)
Repurchase of ordinary shares, net of transaction costs (in shares)	(12,441)				(12,440)
Proceeds from ESPP purchases		446			$ 446
Proceeds from ESPP purchases (in shares)	63
Employee share-based compensation expense		13,285			13,285
Issuance of restricted shares (in shares)	981
Repurchase of shares to satisfy tax withholding		(1,470)			(1,470)
Repurchase of shares to satisfy tax withholding (in shares)	(136)
Net unrealized loss on available-for-sale investments			(271)		(271)
Net loss				(37,733)	(37,733)
Balances at Jun. 30, 2023	$ 1	1,172,090	(286)	(891,644)	$ 280,161
Balances (in shares) at Jun. 30, 2023	53,694				53,694
Balances at Mar. 31, 2023	$ 1	1,246,506	51	(875,999)	$ 370,559
Balances (in shares) at Mar. 31, 2023	60,542
Increase (Decrease) in Stockholders' Equity
Repurchase of ordinary shares, net of transaction costs		(80,543)			$ (80,543)
Repurchase of ordinary shares, net of transaction costs (in shares)	(7,283)				(7,280)
Proceeds from ESPP purchases		446			$ 446
Proceeds from ESPP purchases (in shares)	63
Employee share-based compensation expense		6,264			6,264
Issuance of restricted shares (in shares)	424
Repurchase of shares to satisfy tax withholding		(583)			(583)
Repurchase of shares to satisfy tax withholding (in shares)	(52)
Net unrealized loss on available-for-sale investments			(337)		(337)
Net loss				(15,645)	(15,645)
Balances at Jun. 30, 2023	$ 1	$ 1,172,090	$ (286)	$ (891,644)	$ 280,161
Balances (in shares) at Jun. 30, 2023	53,694				53,694