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INVENTORY - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 20,208 $ 17,464
Work-in-process 5,203 2,977
Finished goods 30,632 15,824
Inventory $ 56,043 $ 36,265