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4. Inventories, net (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Components of inventory
    June 30, 2020     December 31, 2019  
Finished goods   $ 2,781     $ 3,864  
Work in process     3,242       6,122  
Raw materials     3,504       3,527  
    $ 9,527     $ 13,513