CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Ordinary shares	Additional paid-in capital	Additional paid-in capital Cumulative Effect, Period of Adoption, Adjustment	Accumulated other comprehensive loss	Retained earnings (accumulated deficit)	Retained earnings (accumulated deficit) Cumulative Effect, Period of Adoption, Adjustment
Beginning balance at Dec. 31, 2019	$ 217,790			$ 871,442		$ (2,767)	$ (650,885)
Beginning balance (in shares) at Dec. 31, 2019			99,528,435
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation to employees	16,557			16,557
Exercise of options and vested RSUs	4,511			4,511
Exercise of options and vested RSUs (in shares)			834,538
Other comprehensive income (loss), net of tax benefit	(862)					(862)
Net income (loss)	3,952						3,952
Ending balance at Mar. 31, 2020	241,948			892,510		(3,629)	(646,933)
Ending balance (in shares) at Mar. 31, 2020			100,362,973
Beginning balance at Dec. 31, 2019	217,790			871,442		(2,767)	(650,885)
Beginning balance (in shares) at Dec. 31, 2019			99,528,435
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	19,808
Ending balance at Dec. 31, 2020	476,526	$ (128,972)		1,111,435	$ (132,474)	(3,832)	(631,077)	$ 3,502
Ending balance (in shares) at Dec. 31, 2020			102,334,276
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation to employees	18,863			18,863
Exercise of options and vested RSUs	7,961			7,961
Exercise of options and vested RSUs (in shares)			853,184
Other comprehensive income (loss), net of tax benefit	1,884					1,884
Net income (loss)	(4,128)						(4,128)
Ending balance at Mar. 31, 2021	$ 372,134			$ 1,005,785		$ (1,948)	$ (631,703)
Ending balance (in shares) at Mar. 31, 2021			103,187,460