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RELATED PARTIES BALANCES AND TRANSACTIONS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transactions [Abstract]      
Long-term investment $ 66 $ 37  
Cost of revenues $ 13,970
General and Administrative expenses 719 639 234
Other expense (income), net $ (29) $ 13 $ (6)