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 (Loss)	ATM Offering	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 (loss)						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, 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]
Net income (loss)									(27,558)
Foreign currency translation adjustments									(456)
Ending balance (in shares) at Sep. 30, 2020			63,548,081		20,220,227
Ending balance at Sep. 30, 2020			$ 1	908,584	$ (155,947)	144,067	(1,552)		895,153
Beginning balance (in shares) at Mar. 31, 2020			59,813,163		20,220,227
Beginning balance at Mar. 31, 2020			$ 1	543,305	$ (155,947)	175,699	(3,468)		559,590
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)			3,450,000
Issuance of common stock				306,779					306,779
Issuance of common stock under employee plans, net (in shares)			134,571
Issuance of common stock under employee plans, net				(310)					(310)
Stock-based compensation				33,835					33,835
Issuance of common stock for business combination contingent consideration (in shares)			70,613
Net income (loss)						(30,759)			(30,759)
Foreign currency translation adjustments							678		678
Ending balance (in shares) at Jun. 30, 2020			63,468,347		20,220,227
Ending balance at Jun. 30, 2020			$ 1	883,609	$ (155,947)	144,940	(2,790)		869,813
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee plans, net (in shares)			79,734
Issuance of common stock under employee plans, net				(1,119)					(1,119)
Stock-based compensation				26,094					26,094
Net income (loss)						(873)			(873)
Foreign currency translation adjustments							1,238		1,238
Ending balance (in shares) at Sep. 30, 2020			63,548,081		20,220,227
Ending balance at Sep. 30, 2020			$ 1	908,584	$ (155,947)	144,067	(1,552)		895,153
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 (loss)						(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
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]
Net income (loss)									(46,510)
Foreign currency translation adjustments									(1,161)
Ending balance (in shares) at Sep. 30, 2021			67,577,868		20,220,227
Ending balance at Sep. 30, 2021			$ 1	1,147,478	$ (155,947)	123,391	(1,020)		1,113,903
Beginning balance (in shares) at Mar. 31, 2021			64,673,091		20,220,227
Beginning balance at Mar. 31, 2021			$ 1	1,044,724	$ (155,947)	121,984	142		1,010,904
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee plans, net (in shares)			1,001,255
Issuance of common stock under employee plans, net				(3,268)					(3,268)
Stock-based compensation				137,549					137,549
Net income (loss)						(47,117)			(47,117)
Foreign currency translation adjustments							(369)		(369)
Ending balance (in shares) at Jun. 30, 2021			65,674,346		20,220,227
Ending balance at Jun. 30, 2021			$ 1	1,179,005	$ (155,947)	74,867	(227)		1,097,699
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)			577,956					577,956
Issuance of common stock				105,615					105,615
Issuance of common stock under employee plans, net (in shares)			1,325,566
Issuance of common stock under employee plans, net				(172,204)					(172,204)
Stock-based compensation				35,062					35,062
Net income (loss)						48,524			48,524
Foreign currency translation adjustments							(793)		(793)
Ending balance (in shares) at Sep. 30, 2021			67,577,868		20,220,227
Ending balance at Sep. 30, 2021			$ 1	$ 1,147,478	$ (155,947)	$ 123,391	$ (1,020)		$ 1,113,903