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Inventory (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Inventory    
Raw materials $ 1,275 $ 1,275
Work-in-process 21,242 8,634
Finished goods 13,456 6,596
Total inventories 35,973 16,505
Inventories - current 16,425 11,400
Inventories-noncurrent $ 19,548 $ 5,105