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4. Inventories, net (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Components of inventory
   

June 30,

2019

   

December 31,

2018

 
Finished goods   $ 4,290     $ 2,004  
Work in process     5,581       5,750  
Raw materials     3,386       3,712  
    $ 13,257     $ 11,466