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Inventories (Tables)
9 Months Ended
Sep. 30, 2013
Inventory Disclosure [Abstract]  
Summary of Inventories

Inventories are comprised of the following:

 

     September 30,      December 31,  
     2013      2012  

Component parts

   $ 13,772       $ 6,613   

Work-in-process and finished goods

     12,540         12,062   
  

 

 

    

 

 

 

Total

   $ 26,312       $ 18,675