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

Raw materials

  $ 1,631     $ 1,596  

Work-in-process

    2,725       3,173  

Finished goods

    1,052       1,052  
   

 

 

   

 

 

 
      5,408       5,821  

Less: Allowance

    (213     (205
   

 

 

   

 

 

 

Total inventories

  $ 5,195     $ 5,616