Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive (Loss) [Member]	Retained Earnings [Member]
Beginning balance at Dec. 31, 2018	$ 132,585	$ 54	$ (177,905)	$ 307,014	$ (215)	$ 3,637
Beginning balance, shares at Dec. 31, 2018		54,117,325	26,326,280
Issuance of common stock from exercise of options	23			23
Issuance of common stock from exercise of options, shares		10,000
Issuance of common stock from restricted stock awards, shares		112,545
Purchase of common stock through stock buyback	(3,125)		$ (3,125)
Purchase of common stock through stock buyback, shares			220,297
Impact of net settlements	(868)			(868)
Impact of net settlements, shares		6,391	6,391
Stock-based compensation expense	3,179			3,179
Comprehensive income:
Unrealized gain (loss) on foreign currency exchange	41				41
Net income	3,290					3,290
Ending balance at Mar. 31, 2019	135,125	$ 54	$ (181,030)	309,348	(174)	6,927
Ending balance, shares at Mar. 31, 2019		54,246,261	26,552,968
Beginning balance at Dec. 31, 2019	$ 152,951	$ 55	$ (184,972)	317,675	(319)	20,512
Beginning balance, shares at Dec. 31, 2019		54,903,824	26,761,305
Issuance of common stock from exercise of options, shares	0
Issuance of common stock from restricted stock awards, shares		123,027
Purchase of common stock through stock buyback	$ (14,824)		$ (14,824)
Purchase of common stock through stock buyback, shares			736,760
Impact of net settlements	(68)			(68)
Impact of net settlements, shares		230	230
Stock-based compensation expense	5,294			5,294
Comprehensive income:
Unrealized loss on investments	(132)				(132)
Unrealized gain (loss) on foreign currency exchange	(53)				(53)
Net income	2,207					2,207
Ending balance at Mar. 31, 2020	$ 145,375	$ 55	$ (199,796)	$ 322,901	$ (504)	$ 22,719
Ending balance, shares at Mar. 31, 2020		55,027,081	27,498,295