Statements Of Changes In Stockholders' Equity (USD $) In Thousands, unless otherwise specified		Common Stock [Member]		Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]	Total Comprehensive Loss [Member]	Total
Balance at Dec. 31, 2008		$ 27		$ 314,479	$ (107,744)	$ 51	$ (28,186)		$ 178,627
Balance, shares at Dec. 31, 2008		26,731
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan			[1]		4,418		(2,315)		2,103
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan, shares		357
Purchase of treasury stock		(4)			(20,024)				(20,028)
Purchase of treasury stock, shares		(4,187)
Equity-based compensation expenses				11,100					11,100
Total comprehensive loss:
Net loss							(8,436)	(8,436)	(8,436)
Change in unrealized gain (loss) from hedging activities, net						253		253	253
Change in unrealized gain (loss) from marketable securities						1,344		1,344	1,344
Change in unrealized gain (loss) from pension						464		464	464
Change in foreign currency translation adjustments, net						62		62	62
Total comprehensive loss								(6,313)
Balance at Dec. 31, 2009		23		325,579	(123,350)	2,174	(38,937)		165,489
Balance, shares at Dec. 31, 2009		22,901
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan			[1]		4,138		(2,293)		1,845
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan, shares		388
Issuance of treasury stock upon exercise of stock options and stock appreciation rights by employees and directors			[1]		794		(472)		322
Issuance of treasury stock upon exercise of stock options and stock appreciation rights by employees and directors, shares		75
Purchase of treasury stock			[1]		(862)				(862)
Purchase of treasury stock, shares		(111)
Equity-based compensation expenses				9,553					9,553
Total comprehensive loss:
Net loss							(7,425)	(7,425)	(7,425)
Change in unrealized gain (loss) from hedging activities, net						247		247	247
Change in unrealized gain (loss) from marketable securities						(1,255)		(1,255)	(1,255)
Change in unrealized gain (loss) from pension						(538)		(538)	(538)
Change in foreign currency translation adjustments, net						(273)		(273)	(273)
Total comprehensive loss								(9,244)
Balance at Dec. 31, 2010		23		335,132	(119,280)	355	(49,127)		167,103
Balance, shares at Dec. 31, 2010		23,253
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan		1			4,483		(2,448)		2,036
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan, shares		423
Issuance of treasury stock upon exercise of stock options and stock appreciation rights by employees and directors					1,309		(942)		367
Issuance of treasury stock upon exercise of stock options and stock appreciation rights by employees and directors, shares	[1]	124
Purchase of treasury stock		(1)			(8,748)				(8,749)
Purchase of treasury stock, shares		(1,298)
Equity-based compensation expenses				6,220					6,220
Total comprehensive loss:
Net loss							(16,242)	(16,242)	(16,242)
Change in unrealized gain (loss) from hedging activities, net						(950)		(950)	(950)
Change in unrealized gain (loss) from marketable securities						(964)		(964)	(964)
Change in unrealized gain (loss) from pension						37		37	37
Change in foreign currency translation adjustments, net						(234)		(234)	(234)
Total comprehensive loss								(18,354)
Balance at Dec. 31, 2011		$ 23		$ 341,352	$ (122,236)	$ (1,756)	$ (68,759)		$ 148,624
Balance, shares at Dec. 31, 2011		22,502

[1] Represents an amount lower than $ 1.