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Inventory (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Inventory Disclosure [Abstract]      
Raw materials $ 2,695   $ 1,875
Work-in-process 22,365   21,648
Finished goods 3,264   3,536
Total inventory 28,324   $ 27,059
Idle capacity $ 4,400 $ 3,500