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Inventory (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Raw materials $ 1,275 $ 1,275
Work-in-process 35,988 21,242
Finished goods 14,925 13,456
Total inventories 52,188 35,973
Inventories - current 21,303 16,425
Inventories-noncurrent 30,885 $ 19,548
Inventory incurred prior to FDA approval $ 72,100  
Minimum    
Period of lower average per unit cost of materials 3 months  
Maximum    
Period of lower average per unit cost of materials 36 months