Derivative Instruments (Details 1) (Foreign currency option contracts [Member], USD $) In Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011
Designated as Hedging Instrument [Member]
Effect of derivative instruments on the Condensed Balance Sheet and Condensed Consolidated Statements of Operations
Net loss recognized in accumulated other comprehensive loss (effective portion)	$ (17)	$ (3)
Net gain (loss) recognized in net loss (ineffective portion)
Designated as Hedging Instrument [Member] | Other Expense [Member]
Effect of derivative instruments on the Condensed Balance Sheet and Condensed Consolidated Statements of Operations
Net loss reclassified from accumulated other comprehensive loss to net loss (effective portion)	(51)	(84)
Not Designated as Hedging Instrument [Member] | Other Expense [Member]
Effect of derivative instruments on the Condensed Balance Sheet and Condensed Consolidated Statements of Operations
Net loss recognized in net loss, not designated as hedges	$ (205)	$ (633)