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Contingencies and Guarantees (Tables)
6 Months Ended
Jun. 30, 2011
Commitments, Contingencies and Guarantees [Abstract]  
Accrual for product warranties
                 
    June 30,     December 31,  
    2011     2010  
Balance at the beginning of period
  $ 160     $ 36  
Warranty redemptions
    (19 )     (87 )
Warranties issued
    59       211  
 
           
Balance at the end of period
  $ 200     $ 160