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2. Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of inventories
   

December 31,

2019

   

December 31,

2018

 
Raw materials   $ 2,566     $ 3,647  
Work-in-progress     1,455       1,327  
Finished goods     2,497       1,155  
Total inventories   $ 6,518     $ 6,129