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2. Inventories (Tables)
9 Months Ended
Sep. 30, 2014
Inventory Disclosure [Abstract]  
Inventories
    September 30,     December 31,  
    2014     2013  
Raw materials   $ 12,314     $ 10,744  
Work in process     7,097       6,246  
Finished goods     8,997       9,276  
Total inventories   $ 28,408     $ 26,266