Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands		Common Stock Outstanding [Member]		Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings Including Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2017		22,433
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)						(486,422)
Purchase of treasury stock		$ (1)			(5,868)			$ (5,869)
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
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and vesting of 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 purchase of common stock under employee stock purchase plan (in shares)		119
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan			[1]		1,168			1,003
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan						(165)
Balance (in shares) at Jun. 30, 2018		22,461
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
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)
Purchase of treasury stock		$ (1)			(4,613)			(4,614)
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
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and vesting of restricted stock units by employees and directors				10	1,144	(867)		287
Equity-based compensation				1,660				1,660
Balance (in shares) at Jun. 30, 2018		22,461
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
Balance (in shares) at Dec. 31, 2018		22,266
Balance at Dec. 31, 2018		$ 22		378,855	(122,325)	(112,363)	(2,324)	141,865
Net loss						(1,587)		(1,587)
Change in accumulated other comprehensive income							1,378	$ 1,378
Purchase of treasury stock (in shares)								0
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and vesting of restricted stock units by employees and directors (in shares)		435
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and vesting of restricted stock units by employees and directors		$ 1		29	4,363	(3,296)		$ 1,097
Equity-based compensation				3,965				3,965
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan (in shares)		102
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan			[1]		1,022			971
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan						(51)
Balance (in shares) at Jun. 30, 2019		22,803
Balance at Jun. 30, 2019		$ 23		382,849	(116,940)	(117,297)	(946)	147,689
Balance (in shares) at Mar. 31, 2019		22,701
Balance at Mar. 31, 2019		$ 23		380,777	(117,968)	(115,894)	(1,525)	145,413
Net loss						(521)		(521)
Change in accumulated other comprehensive income							579	579
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and vesting of restricted stock units by employees and directors (in shares)		102
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and vesting of restricted stock units by employees and directors				12	1,028	(882)		158
Equity-based compensation				2,060				2,060
Balance (in shares) at Jun. 30, 2019		22,803
Balance at Jun. 30, 2019		$ 23		$ 382,849	$ (116,940)	$ (117,297)	$ (946)	$ 147,689

[1] Represents an amount lower than $1.

[2] Resulting from adoption of ASC 606.