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Inventories (Tables)
6 Months Ended
Jun. 30, 2012
Inventories [Abstract]  
Summary of Inventories

Inventories are comprised of the following:

 

                 
    June 30,
2012
    December 31,
2011
 

Component parts

  $ 7,154     $ 6,447  

Work-in-process and finished goods

    9,935       9,586  
   

 

 

   

 

 

 

Total

  $ 17,089     $ 16,033