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Inventory - Schedule of Inventory, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 1,892 $ 1,355
Work in process 2,986 3,110
Finished goods 3,731 2,359
Total $ 8,609 $ 6,824