Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning Balance Value at Dec. 31, 2016	$ 293,735	$ 31	$ 381,189	$ (2,779)	$ (84,706)
Beginning Balance Shares at Dec. 31, 2016		25,033,000
Issuance of shares through share-based compensation plans, net	624	$ 1	623
Issuance of shares through share-based compensation plans, net, Shares		348,000
Net income	32,909				32,909
Share-based compensation	5,670		5,670
Cumulative effect of a change in accounting for share-based compensation			72		(72)
Share-based compensation plan withholdings	(1,358)		(1,358)
Share-based compensation plan withholdings, Shares		(47,000)
Redemption of stock warrants, shares		82,000
Currency translation	1,663			1,663
Unrealized gain (loss) on investments	(89)			(89)
Ending Balance Value at Dec. 31, 2017	333,154	$ 32	386,196	(1,205)	(51,869)
Ending Balance Shares at Dec. 31, 2017		25,416,000
Issuance of shares through share-based compensation plans, net	624		624
Issuance of shares through share-based compensation plans, net, Shares		358,000
Repurchase of common stock	(21,069)	$ (1)	(21,068)
Repurchase of common stock, Shares		(853,000)
Net income	45,096				45,096
Share-based compensation	6,062		6,062
Share-based compensation plan withholdings	(1,921)		(1,921)
Share-based compensation plan withholdings, Shares		(66,000)
Currency translation	(194)			(194)
Unrealized gain (loss) on investments	136			136
Ending Balance Value at Dec. 31, 2018	$ 361,888	$ 31	369,893	(1,263)	(6,773)
Ending Balance Shares at Dec. 31, 2018	24,855,000	24,855,000
Effect of merger	$ 890,131	$ 19	890,112
Effect of merger, Shares		25,060,000
Issuance of shares through share-based compensation plans, net	2,131		2,131
Issuance of shares through share-based compensation plans, net, Shares		377,000
Repurchase of common stock	(744)		(744)
Repurchase of common stock, Shares		(30,000)
Net income	1,910				1,910
Share-based compensation	10,585		10,585
Share-based compensation plan withholdings	(2,540)		(2,540)
Share-based compensation plan withholdings, Shares		(78,000)
Currency translation	709			709
Unrealized gain (loss) on investments	(44)			(44)
Ending Balance Value at Dec. 31, 2019	$ 1,264,026	$ 50	$ 1,269,437	$ (598)	$ (4,863)
Ending Balance Shares at Dec. 31, 2019	50,184,000	50,184,000