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2. Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Inventory, Net [Abstract]  
Schedule of Inventories
   

June 30,

2018

   

December 31,

2017

 
Raw materials   $ 3,585     $ 2,829  
Work-in-progress     2,102       1,605  
Finished goods     1,010       1,303  
Total inventories   $ 6,697     $ 5,737