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Inventories - Inventories, Net of Reserves (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventories    
Raw materials $ 737 $ 847
Finished goods 7,101 10,594
Total current inventory 7,838 11,441
Raw materials 2,751 1,915
Finished goods 3,532 4,369
Total long-term inventory $ 6,283 $ 6,284