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4. Inventories, net (Tables)
3 Months Ended
Mar. 31, 2018
Inventories Net Tables  
Components of inventory
   

March 31,

2018

   

December 31,

2017

 
Finished goods   $ 2,234     $ 2,825  
Work in process     8,780       7,111  
Raw materials     4,304       4,422  
    $ 15,318     $ 14,358