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Product Warranties (Tables)
9 Months Ended
Sep. 30, 2013
Guarantees [Abstract]  
Product Warranty Activity

Product warranty activity for the three and nine months ended September 30, was as follows (in thousands):

 

     Three Months Ended
September 30,
    Nine Months Ended
September 30,
 
     2013     2012     2013     2012  

Balance at the beginning of the period

   $ 329     $ 461     $ 364     $ 572  

Accruals for warranties for products sold in the period

     127       161       228       379  

Fulfillment of warranty obligations

     (110     (133     (220     (430

Revisions of estimated obligations

     1       (8     (25     (40
  

 

 

   

 

 

   

 

 

   

 

 

 

Balance at the end of the period

   $ 347     $ 481     $ 347     $ 481