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4. Inventories, net (Tables)
9 Months Ended
Sep. 30, 2018
Inventories Net  
Components of inventory
   

September 30,

2018

   

December 31,

2017

 
Finished goods   $ 2,137     $ 2,825  
Work in process     4,432       7,111  
Raw materials     4,119       4,422  
    $ 10,688     $ 14,358