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Inventories (Tables)
3 Months Ended
Mar. 31, 2013
Inventories [Abstract]  
Summary of inventory on hand
                 
    March 31,
2013
    December 31,
2012
 

Raw materials

  $ 1,014     $ 516  

Work-in-process

    1,416       925  

Finished goods

    745       552  
   

 

 

   

 

 

 

Total

  $ 3,175     $ 1,993