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INVENTORY - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 31,700 $ 31,203
Work-in-process 5,709 781
Finished goods 22,729 38,016
Inventory $ 60,138 $ 70,000