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Product Warranties
 12 Months Ended
Dec. 31, 2011
Product Warranties [Abstract]  
PRODUCT WARRANTIES

11.  PRODUCT WARRANTIES

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

 

                         
    2011     2010     2009  

Balance at the beginning of the period

   $ 649     $ 772     $ 896  

Accruals for warranties for products sold in the period

     1,392       573       205  

Fulfillment of warranty obligations

     (1,134 )      (548 )      (101 ) 

Revisions of estimated obligations

     (335 )      (148 )      (228 ) 
   

 

 

    

 

 

    

 

 

  

Balance at the end of the period

   $ 572     $ 649     $ 772