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Inventory - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 9,349 $ 10,112
Work in process 13,026 20,604
Finished goods 6,895 8,316
Total inventory $ 29,270 $ 39,032