Inventory - Components of Inventory (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 2,078	$ 2,278
Work in process	101,641	137,858
Finished goods	38,636	42,096
Total inventory	142,355	182,232
Balance Sheet Classification:
Inventory	104,603	116,349
Other assets	$ 37,752	$ 65,883