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Inventory - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 2,519 $ 1,351
Work-in-process 14,432 15,647
Finished goods 32,244 30,085
Total $ 49,195 $ 47,083