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INVENTORIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 11,742 $ 16,500
Work-in-process 11,621 8,371
Finished goods 7,915 16,540
Total 31,278 $ 41,411
Inventory Write-down $ 20,700