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5. Inventory (Tables)
9 Months Ended
Sep. 30, 2013
Inventory Disclosure [Abstract]  
Schedule of inventories
   September 30, 2013   December 31, 2012 
Raw materials  $6,710   $4,755 
Work in process   6,539    4,434 
Finished goods    3,172    3,304 
   $16,421   $12,493