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Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventory    
Raw Materials $ 1,387 $ 1,387
Work in Progress 3,541 4,166
Finished Goods 4,165 2,873
Total inventory 9,093 8,426
Inventory 5,272 4,648
Long-term inventory $ 3,821 $ 3,778