Condensed Statements of Stockholders' Equity (Unaudited) (USD $) In Thousands	Total	Common Stock		Additional Paid-In Capital	Treasury Stock	Accumulated deficit	Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2010	$ 167,103	$ 23		$ 335,132	$ (119,280)	$ (49,127)	$ 355
Beginning Balance, shares at Dec. 31, 2010		23,253
Net loss	(6,605)					(6,605)
Change in unrealized loss from hedging activities, net	66						66
Change in unrealized gain from marketable securities, net	339						339
Change in unrealized gain from pensions, net	37						37
Change in foreign currency translation adjustments, net	268						268
Purchase of treasury stock	(2,161)		[1]		(2,161)
Purchase of treasury stock, shares		(268)
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan	1,019		[1]		2,278	(1,259)
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan, shares		214
Issuance of treasury stock upon exercise of stock options and stock appreciation rights by employees	367		[1]		1,221	(854)
Issuance of treasury stock upon exercise of stock options and stock appreciation rights by employees, shares		115
Equity-based compensation	3,712			3,712
Ending Balance at Jun. 30, 2011	164,145	23		338,844	(117,942)	(57,845)	1,065
Ending Balance, shares at Jun. 30, 2011		23,314
Beginning Balance at Mar. 31, 2011	164,442	23		336,971	(117,493)	(55,316)	257
Beginning Balance, shares at Mar. 31, 2011		23,388
Net loss	(2,041)					(2,041)
Change in unrealized loss from hedging activities, net	54						54
Change in unrealized gain from marketable securities, net	531						531
Change in foreign currency translation adjustments, net	223						223
Purchase of treasury stock	(1,131)		[1]		(1,131)
Purchase of treasury stock, shares		(139)
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan	194		[1]		682	(488)
Issuance of treasury stock upon exercise of stock options and stock appreciation rights by employees, shares		65
Equity-based compensation	1,873			1,873
Ending Balance at Jun. 30, 2011	164,145	23		338,844	(117,942)	(57,845)	1,065
Ending Balance, shares at Jun. 30, 2011		23,314
Beginning Balance at Dec. 31, 2011	148,624	23		341,352	(122,236)	(68,759)	(1,756)
Beginning Balance, shares at Dec. 31, 2011		22,502
Net loss	(5,486)					(5,486)
Change in unrealized loss from hedging activities, net	210						210
Change in unrealized gain from marketable securities, net	920						920
Change in unrealized gain from pensions, net	1						1
Change in foreign currency translation adjustments, net	(21)						(21)
Purchase of treasury stock	(7,513)		[1]		(7,512)
Purchase of treasury stock, shares		(1,183)
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan	1,012		[1]		2,331	(1,319)
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan, shares		228
Issuance of treasury stock upon exercise of stock options and stock appreciation rights by employees			[1]		80	(80)
Issuance of treasury stock upon exercise of stock options and stock appreciation rights by employees, shares		8
Equity-based compensation	2,944			2,945
Ending Balance at Jun. 30, 2012	140,691	22		344,297	(127,338)	(75,644)	(646)
Ending Balance, shares at Jun. 30, 2012		21,555
Beginning Balance at Mar. 31, 2012	145,097	22		342,838	(124,315)	(73,372)	(76)
Beginning Balance, shares at Mar. 31, 2012		22,042
Net loss	(2,224)					(2,224)
Change in unrealized loss from hedging activities, net	(352)						(352)
Change in unrealized gain from marketable securities, net	(176)						(176)
Change in foreign currency translation adjustments, net	(42)						(42)
Purchase of treasury stock	(3,070)		[1]		(3,071)
Purchase of treasury stock, shares		(492)
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan					48	(48)
Issuance of treasury stock upon exercise of stock options and stock appreciation rights by employees, shares		5
Equity-based compensation	1,458			1,458
Ending Balance at Jun. 30, 2012	$ 140,691	$ 22		$ 344,297	$ (127,338)	$ (75,644)	$ (646)
Ending Balance, shares at Jun. 30, 2012		21,555

[1] Represents an amount lower than $1.