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Inventories (Tables)
3 Months Ended
Mar. 31, 2013
Inventories [Abstract]  
Summary of inventories
                 
    March 31, 2013     December 31, 2012  
    (in thousands)  

Raw materials

  $ 2,776     $ 2,471  

Work-in-process

    2,259       2,084  

Finished products

    6,230       6,304  
   

 

 

   

 

 

 
     

Total inventory

  $ 11,265     $ 10,859