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Inventory - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 5,681 $ 3,858
Work-in-process 7,190 13,671
Finished goods 23,403 27,196
Total inventory $ 36,274 $ 44,725