Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands		Common Stock [Member]		Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2016		21,932,000
Balance at Dec. 31, 2016		$ 22		$ 366,121	$ (122,632)	$ (96,112)	$ (1,852)	$ 145,547
Net loss						(3,452)		(3,452)
Change in accumulated other comprehensive income							461	461
Purchase of treasury stock (in shares)		(248,000)
Purchase of treasury stock			[1]		(2,802)			(2,802)
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and restricted stock units by employees and directors					3,471	(3,136)		335
Equity-based compensation				3,088				3,088
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and vesting of restricted stock units by employees and directors (in shares)		354,000
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan (in shares)		113,000
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan			[1]		1,109	(167)		942
Balance (in shares) at Jun. 30, 2017		22,151,000
Balance at Jun. 30, 2017		$ 22		369,209	(120,854)	(102,867)	(1,391)	144,119
Balance (in shares) at Mar. 31, 2017		22,169,000
Balance at Mar. 31, 2017		$ 22		367,652	(120,404)	(101,276)	(1,537)	144,457
Net loss						(586)		(586)
Change in accumulated other comprehensive income							146	146
Purchase of treasury stock (in shares)		(124,000)
Purchase of treasury stock			[1]		(1,490)			(1,490)
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and restricted stock units by employees and directors			[1]		1,040	(1,005)		35
Equity-based compensation				1,557				1,557
Balance (in shares) at Jun. 30, 2017		22,151,000
Balance at Jun. 30, 2017		$ 22		369,209	(120,854)	(102,867)	(1,391)	144,119
Balance (in shares) at Dec. 31, 2017		22,433,000
Balance at Dec. 31, 2017		$ 22		372,041	(118,397)	(104,842)	(1,874)	146,950
Net loss						(2,041)		(2,041)
Change in accumulated other comprehensive income							(824)	$ (824)
Purchase of treasury stock (in shares)		(486,000)						(486,422)
Purchase of treasury stock		$ (1)			(5,868)			$ (5,869)
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and restricted stock units by employees and directors		$ 1		10	3,897	(3,466)		442
Equity-based compensation				3,359				3,359
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and vesting of restricted stock units by employees and directors (in shares)		395,000
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan (in shares)		119,000
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan			[1]		1,168	(165)		1,003
Balance (in shares) at Jun. 30, 2018		22,461,000
Balance at Jun. 30, 2018		$ 22		375,410	(119,200)	(110,420)	(2,698)	143,114
Balance (in shares) at Mar. 31, 2018		22,729,000
Balance at Mar. 31, 2018		$ 23		373,740	(115,731)	(109,265)	(2,517)	146,250
Net loss						(288)		(288)
Change in accumulated other comprehensive income							(181)	(181)
Purchase of treasury stock (in shares)		(384,000)
Purchase of treasury stock		$ (1)			(4,613)			(4,614)
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and restricted stock units by employees and directors			[1]	10	1,144	(867)		287
Equity-based compensation				1,660				1,660
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and vesting of restricted stock units by employees and directors (in shares)		116,000
Balance (in shares) at Jun. 30, 2018		22,461,000
Balance at Jun. 30, 2018		$ 22		$ 375,410	$ (119,200)	(110,420)	$ (2,698)	143,114
Cumulative effect adjustment on retained earnings **	[2]					$ 94		$ 94

[1] Represents an amount lower than $1.

[2] Resulting from adoption of ASC 606.