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4. Inventories, net (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Components of inventory
    September 30, 2020     December 31, 2019  
Finished goods   $ 1,817     $ 3,864  
Work in process     2,994       6,122  
Raw materials     3,615       3,527  
    $ 8,426     $ 13,513