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2. Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of inventories
    June 30, 2019     December 31, 2018  
Raw materials   $ 1,405     $ 3,647  
Work-in-progress     1,599       1,327  
Finished goods     1,089       1,155  
Total inventories   $ 4,093     $ 6,129