Unaudited Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Cumulative Effect, Period of Adoption, Adjustment Retained Earnings	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Loss	Total
Beginning balance (in shares) at Dec. 31, 2018			58,810,637		20,220,227
Beginning balance at Dec. 31, 2018			$ 1	$ 453,400	$ (155,947)	$ 171,383	$ (1,513)	$ 467,324
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee plans, net (in shares)			298,649
Issuance of common stock under employee plans, net				(1,159)				(1,159)
Stock-based compensation				7,905				7,905
Net income (loss)						6,419		6,419
Foreign currency translation adjustments							50	50
Ending balance (in shares) at Mar. 31, 2019			59,109,286		20,220,227
Ending balance at Mar. 31, 2019			$ 1	460,146	$ (155,947)	177,802	(1,463)	480,539
Beginning balance (in shares) at Dec. 31, 2018			58,810,637		20,220,227
Beginning balance at Dec. 31, 2018			$ 1	453,400	$ (155,947)	171,383	(1,513)	467,324
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)								7,157
Foreign currency translation adjustments								(58)
Ending balance (in shares) at Jun. 30, 2019			59,251,731		20,220,227
Ending balance at Jun. 30, 2019			$ 1	467,904	$ (155,947)	178,540	(1,571)	488,927
Beginning balance (in shares) at Mar. 31, 2019			59,109,286		20,220,227
Beginning balance at Mar. 31, 2019			$ 1	460,146	$ (155,947)	177,802	(1,463)	480,539
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee plans, net (in shares)			71,832
Issuance of common stock under employee plans, net				(869)				(869)
Stock-based compensation				8,627				8,627
Issuance of common stock for business combination (in shares)			70,613
Net income (loss)						738		738
Foreign currency translation adjustments							(108)	(108)
Ending balance (in shares) at Jun. 30, 2019			59,251,731		20,220,227
Ending balance at Jun. 30, 2019			$ 1	467,904	$ (155,947)	178,540	(1,571)	488,927
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)								(26,685)
Foreign currency translation adjustments								(1,694)
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
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 (in shares)			70,613
Issuance of common stock for business combination								0
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