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Product Warranties (Tables)
3 Months Ended
Mar. 31, 2013
Product Warranties [Abstract]  
Product warranty activity
                 
   

Three Months Ended

March 31,

 
    2013     2012  
     

Balance at the beginning of the period

  $ 364     $ 572  

Accruals for warranties for products sold in the period

    29       82  

Fulfillment of warranty obligations

    (47     (100

Revisions of estimated obligations

    (22     —    
   

 

 

   

 

 

 

Balance at the end of the period

  $ 324     $ 554