Unaudited Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Cumulative Effect Period Of Adoption Adjusted Balance Retained Earnings	Cumulative Effect Period Of Adoption Adjusted Balance	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income	Total
Beginning balance (in shares) at Dec. 31, 2019			59,497,759		20,220,227
Beginning balance at Dec. 31, 2019	$ (640)	$ (640)	$ 1	$ 528,272	$ (155,947)	$ 172,265	$ (1,096)	$ 543,495
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee plans, net (in shares)			315,404
Issuance of common stock under employee plans, net				(5,162)				(5,162)
Stock-based compensation				20,195				20,195
Net income						4,074		4,074
Foreign currency translation adjustments							(2,372)	(2,372)
Ending balance (in shares) at Mar. 31, 2020			59,813,163		20,220,227
Ending balance at Mar. 31, 2020			$ 1	543,305	$ (155,947)	175,699	(3,468)	559,590
Beginning balance (in shares) at Dec. 31, 2020			63,766,555		20,220,227
Beginning balance at Dec. 31, 2020			$ 1	962,159	$ (155,947)	169,901	141	976,255
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee plans, net (in shares)			906,536
Issuance of common stock under employee plans, net				(7,045)				(7,045)
Stock-based compensation				89,610				89,610
Net income						(47,917)		(47,917)
Foreign currency translation adjustments							1	1
Ending balance (in shares) at Mar. 31, 2021			64,673,091		20,220,227
Ending balance at Mar. 31, 2021			$ 1	$ 1,044,724	$ (155,947)	$ 121,984	$ 142	$ 1,010,904