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Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 18,605 $ 10,347
Work-in-process 40,962 30,222
Finished goods 30,640 30,845
Total inventories $ 90,207 $ 71,414