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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 1,012 $ 6,544
Work-in-process 8,201 3,660
Finished goods 6,554 3,837
Total inventories 15,767 14,041
Reserve for inventory $ 100 $ 200