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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2012
Commitments and Contingencies [Abstract]  
Summary of liability related to lease
                 
    2012     2011  

Balance as of January 1

  $ 452     $ 567  

Net rental receipts (payments)

    (19     20  

Accretion of discount

    18       22  

Increase in estimated contract termination costs

    39       —    
   

 

 

   

 

 

 

Balance as of June 30

  $ 490     $ 609  
   

 

 

   

 

 

 
Summary of reconciliation of Company's warranty reserve
                 
    2012     2011  

Beginning balance, January 1

  $ 16,345     $ 14,472  

Provision for estimated warranties

    1,487       —    

Settlements made during the period

    (3,891     (3,476
   

 

 

   

 

 

 

Ending balance, June 30

  $ 13,941     $ 10,996