Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2016		52,325,251		20,220,227
Beginning balance at Dec. 31, 2016	$ 150,888	$ 1	$ 187,656	$ (155,947)	$ 118,275	$ 903
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,207
Foreign currency translation adjustments	(2,370)
Beginning balance (in shares) at Dec. 31, 2017		52,969,869		20,220,227
Beginning balance at Dec. 31, 2017	167,444	$ 1	201,672	$ (155,947)	123,185	(1,467)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)		4,645,000
Issuance of common stock	233,993		233,993
Issuance of common stock for business combination contingent consideration (in shares)		58,843
Issuance of common stock for business combination contingent consideration	8,226		8,226
Issuance of common stock under employee plans, net (in shares)		1,136,925
Issuance of common stock under employee plans, net	(12,370)		(12,370)
Stock-based compensation	21,879		21,879
Net income	29,205				29,205
Foreign currency translation adjustments	(46)					(46)
Beginning balance (in shares) at Dec. 31, 2018		58,810,637		20,220,227
Beginning balance at Dec. 31, 2018	467,324	$ 1	453,400	$ (155,947)	171,383	(1,513)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for business combination contingent consideration (in shares)		70,613
Issuance of common stock under employee plans, net (in shares)		616,509
Issuance of common stock under employee plans, net	(3,937)		(3,937)
Stock-based compensation	78,809		78,809
Net income	882				882
Foreign currency translation adjustments	417					417
Beginning balance (in shares) at Dec. 31, 2019		59,497,759		20,220,227
Beginning balance at Dec. 31, 2019	$ 543,495	$ 1	$ 528,272	$ (155,947)	$ 172,265	$ (1,096)