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4. Inventories, net (Tables)
6 Months Ended
Jun. 30, 2017
Inventories Net Tables  
Components of inventory
   June 30, 2017  December 31, 2016
Finished goods  $3,214   $3,216 
Work in process   7,038    6,612 
Raw materials   4,541    4,171 
   $14,793   $13,999