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Inventories - Inventories, Net of Reserves (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Inventories    
Raw materials $ 894 $ 847
Finished goods 7,330 10,594
Total current inventory 8,224 11,441
Raw materials 2,999 1,915
Finished goods 3,511 4,369
Total long-term inventory $ 6,510 $ 6,284