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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2013
Commitments and Contingencies [Abstract]  
Summary of liability related to lease
                 
    2013     2012  

Balance as of January 1

  $ 1,103     $ 452  

Net rental receipts (payments)

    (110     (8

Accretion of discount

    21       9  

Increase in net estimated contract termination costs

    —         —    
   

 

 

   

 

 

 

Balance as of March 31

  $ 1,014     $ 453  
   

 

 

   

 

 

 
Summary of reconciliation of Company's warranty reserve
                 
    2013     2012  

Beginning balance, January 1

  $ 28,987     $ 16,345  

Provision for estimated warranties

    —         403  

Settlements made during the period

    (1,681     (1,823
   

 

 

   

 

 

 

Ending balance, March 31

  $ 27,306     $ 14,925