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2. Inventories (Tables)
 3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
    March 31,     December 31,  
    2017     2016  
Raw materials   $ 14,191     $ 12,984  
Work in process     7,014       6,230  
Finished goods     9,149       9,801  
Total inventories   $ 30,354     $ 29,015