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4. Inventories, net (Tables)
6 Months Ended
Jun. 30, 2016
Inventories Net Tables  
Components of inventory
   

June 30,

2016

   

December 31,

2015

 
Finished goods   $ 4,427     $ 4,029  
Work in process     7,405       8,497  
Raw materials     4,066       3,756  
    $ 15,898     $ 16,282