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Inventories - Inventories, Net of Reserves (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventories    
Raw materials $ 756 $ 847
Finished goods 9,594 10,594
Total current inventory 10,350 11,441
Raw materials 1,862 1,915
Finished goods 3,884 4,369
Total long-term inventory $ 5,746 $ 6,284