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4. Inventories, net (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Components of inventory
    March 31, 2020     December 31, 2019  
Finished goods   $ 2,680     $ 3,864  
Work in process     4,725       6,122  
Raw materials     3,532       3,527  
    $ 10,937     $ 13,513