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INVENTORY - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 17,464 $ 6,539
Work-in-process 2,977 3,719
Finished goods 15,824 7,056
Inventory $ 36,265 $ 17,314