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Inventory (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventory    
Raw materials $ 1,275 $ 1,275
Work-in-process 9,745 8,634
Finished goods 14,689 6,596
Total inventories 25,709 16,505
Inventories - current 17,012 11,400
Inventories-noncurrent $ 8,697 $ 5,105