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INVENTORY - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 20,496 $ 17,464
Work-in-process 8,615 2,977
Finished goods 24,527 15,824
Inventory $ 53,638 $ 36,265