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2. Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories
    As of        
   

March 31,

2020  

   

December 31,

2019  

 
Raw materials   $ 2,394     $ 2,566  
Work-in-progress     1,367       1,455  
Finished goods     1,485       2,497  
Total inventories   $ 5,246     $ 6,518