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Inventory - Components of Inventory (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 2,493 $ 2,278
Work in process 90,160 137,858
Finished goods 27,524 42,096
Total inventory 120,177 182,232
Balance Sheet Classification:    
Inventory 88,242 116,349
Other assets $ 31,935 $ 65,883