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Inventory (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Inventory    
Raw materials $ 1,275 $ 1,275
Work-in-process 10,619 8,634
Finished goods 13,995 6,596
Total inventories 25,889 16,505
Inventories - current 16,335 11,400
Inventories-noncurrent $ 9,554 $ 5,105