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Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 15,856 $ 13,595
Work in process 42,582 36,658
Finished goods 34,096 28,355
Total inventories $ 92,534 $ 78,608