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Inventory (Tables)
 6 Months Ended
Jun. 30, 2011
Inventory (Tables) [Abstract]  
Inventory
                 
    June 30,     December 31,  
    2011     2010  
Raw materials
  $ 8,985     $ 6,101  
Work-in-process
    808       —  
Finished goods
    4       1,165  
 
           
Total
  $ 9,797     $ 7,266