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Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Inventory    
Raw materials $ 1,275 $ 1,275
Work-in-process 27,043 21,242
Finished goods 12,061 13,456
Total inventories 40,379 35,973
Inventories - current 16,700 16,425 [1]
Inventories-noncurrent $ 23,679 $ 19,548 [1]
[1] The condensed consolidated balance sheet at December 31, 2020 has been derived from the audited consolidated financial statements at that date.