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Inventory - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 11,896 $ 10,447
Work in process 7,168 5,509
Finished goods 15,508 10,124
Total inventory $ 34,572 $ 26,080