Derivative Instruments (Tables)
6 Months Ended
Jun. 30, 2012
Derivative Instruments [Abstract]  
Derivative instruments measured at fair value
                                 
    (Liability) as of
June 30,
    (Liability) as of
December 31,
 
    2012     2011  
                (unaudited)  
    Notional
Amount
    Fair Value     Notional
Amount
    Fair Value  

Forward foreign exchange contracts included in accrued and other current liabilities

  $ 21,237     $ (560   $ 20,135     $ (631
Gains (losses) on derivative instruments and their classification on the condensed consolidated statement of operations
                                 
    Three months ended
June  30,
    Six months ended
June  30,
 
    2012     2011     2012     2011  

Foreign Exchange Forward Contract Derivatives in cash flow hedging relationships:

                               

Net gain (loss) recognized in OCI (a)

  $ (690   $ 41     $ (110   $ 66  

Net gain (loss) recognized from accumulated OCI into net loss (b)

    (105     242       (181     535  

Net gain (loss) recognized in net loss (c)

    (1     15       (5     55  
         

Foreign Exchange Forward Contract Derivatives not designated as hedging relationships:

                               

Net gain (loss) recognized in net loss (d)

  $ (33   $ —       $ 16     $ —