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Product Warranties
12 Months Ended
Dec. 31, 2013
Guarantees [Abstract]  
Product Warranties

11. PRODUCT WARRANTIES

Product warranty activity for the years ended December 31 was as follows (in thousands):

 

     2013     2012     2011  

Balance at the beginning of the period

   $ 364     $ 572     $ 649  

Accruals for warranties for products sold in the period

     327       439       1,392  

Fulfillment of warranty obligations

     (297     (554     (1,134

Revisions of estimated obligations

     (111     (93     (335
  

 

 

   

 

 

   

 

 

 

Balance at the end of the period

   $ 283     $ 364     $ 572