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2. Inventory (Tables)
9 Months Ended
Sep. 30, 2018
Inventory, Net [Abstract]  
Schedule of Inventory
   

September 30,

2018

   

December 31,

2017

 
Raw materials   $ 4,201     $ 2,829  
Work-in-progress     2,697       1,605  
Finished goods     784       1,303  
Total inventories   $ 7,682     $ 5,737