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Inventories - Inventories, Net of Reserves (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Current:    
Raw materials $ 1,090 $ 1,182
Finished goods 8,113 9,281
Total current inventory 9,203 10,463
Long-term:    
Raw materials 2,237 1,977
Finished goods 1,742 2,613
Total long-term inventory $ 3,979 $ 4,590