Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Treasury Stock	Retained Earnings
Balances at Dec. 31, 2016	$ 117,262	$ 34	$ 92,782	$ (2,114)	$ (36,145)	$ 62,705
Balances (in shares) at Dec. 31, 2016		33,840
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	15,100					15,100
Other comprehensive income (loss)	1,766			1,766
Purchase of shares of treasury stock	(1,492)				(1,492)
Restricted stock release (in shares)		262
Employee stock purchase plan release	29		29
Employee stock purchase plan release (in shares)		2
Stock-based compensation expense	3,602		3,602
Payment of withholding taxes on restricted stock units	(268)		(268)
Balances at Dec. 31, 2017	135,999	$ 34	96,145	(348)	(37,637)	77,805
Balances (in shares) at Dec. 31, 2017		34,104
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	39,189					39,189
Other comprehensive income (loss)	(1,062)			(1,062)
Purchase of shares of treasury stock	(12,096)				(12,096)
Restricted stock release (in shares)		351
Employee stock purchase plan release	54		54
Employee stock purchase plan release (in shares)		2
Stock-based compensation expense	3,009		3,009
Payment of withholding taxes on restricted stock units	(2,722)		(2,722)
Balances at Dec. 31, 2018	158,491	$ 34	96,486	(1,410)	(49,733)	113,114
Balances (in shares) at Dec. 31, 2018		34,457
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	13,920					13,920
Other comprehensive income (loss)	(221)			(221)
Purchase of shares of treasury stock	(722)				(722)
Restricted stock release (in shares)		275
Employee stock purchase plan release	61		61
Employee stock purchase plan release (in shares)		7
Shares issued as consideration for acquisition of HALO	12,968	$ 2	12,966
Shares issued as consideration for acquisition (in shares)		1,458
Shares issued as consideration for acquisition of Gear4	3,886	$ 1	3,885
Purchase of Gear4 (in shares)		413
Stock-based compensation expense	4,022		4,022
Payment of withholding taxes on restricted stock units	(887)		(887)
Balances at Dec. 31, 2019	191,479	$ 37	$ 116,533	$ (1,631)	$ (50,455)	$ 126,995
Balances (in shares) at Dec. 31, 2019		36,610
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting change	$ 0