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Deferred Warranty Revenue and Warranty Reserve (Tables)
 12 Months Ended
Dec. 31, 2012
Deferred Warranty Revenue and Warranty Reserve [Abstract]  
Deferred warranty revenue

Activity in the warranty reserve account during the three years ended December 31, 2012 was as follows:

 

                         
    2012     2011     2010  

Balance, beginning of period

   $ 36     $ 61     $ 150  

Provision for warranty claims

     139       59       105  

Product or cash issued to settle claims

     (130 )      (84 )      (194 ) 
   

 

 

    

 

 

    

 

 

  

Balance, end of period

   $ 45     $ 36     $ 61  
   

 

 

    

 

 

    

 

 

  
Schedule of Warranty Activity

Deferred warranty revenue at December 31, 2012, which will be recognized as revenue, is as follows:

 

         

Year

   Amount  

2013

   $ 35  

2014

     28  

2015

     26  

2016

     9  

2017

     5  
   

 

 

  

Total

   $ 103