Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock Outstanding [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balances (in shares) at Dec. 31, 2018	32,382		8,295
Balances at Dec. 31, 2018	$ 5	$ 310,660	$ (79,142)	$ (30,452)	$ (1,276)	$ 199,795
Issuance of common stock in connection with employee stock purchase plan (in shares)	87
Issuance of common stock in connection with employee stock purchase plan		782				782
Issuance of common stock in connection with exercise of options (in shares)	87
Issuance of common stock in connection with exercise of options		518				518
Vesting of restricted stock units (in shares)	104
Vesting of restricted stock units
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)			54
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			$ (557)			(557)
Stock-based compensation expense		3,469				3,469
Comprehensive income (loss)				(2,691)	(52)	(2,743)
Repurchases of common stock (in shares)	(314)		314
Repurchases of common stock			$ (3,917)			(3,917)
Balances (in shares) at Mar. 31, 2019	32,346		8,663
Balances at Mar. 31, 2019	$ 5	315,429	$ (83,616)	(33,143)	(1,328)	197,347
Balances (in shares) at Dec. 31, 2019	32,503		9,294
Balances at Dec. 31, 2019	$ 5	325,197	$ (91,695)	(35,870)	(1,480)	196,157
Issuance of common stock in connection with employee stock purchase plan (in shares)	89
Issuance of common stock in connection with employee stock purchase plan		810				$ 810
Issuance of common stock in connection with exercise of options (in shares)	21					21
Issuance of common stock in connection with exercise of options		161				$ 161
Vesting of restricted stock units (in shares)	182
Vesting of restricted stock units
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)			93
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			$ (1,478)			(1,478)
Stock-based compensation expense		3,513				3,513
Comprehensive income (loss)				(528)	(166)	(694)
Balances (in shares) at Mar. 31, 2020	32,795		9,387
Balances at Mar. 31, 2020	$ 5	$ 329,681	$ (93,173)	$ (36,398)	$ (1,646)	$ 198,469