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OTHER NON-CURRENT ASSETS (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Prepaid Expense and Other Assets, Noncurrent [Abstract]    
Deferred installation expenses [1] $ 552 $ 682
Deposits 387 833
Other non-current assets $ 939 $ 1,515
[1] See Note 1W.