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OTHER NON-CURRENT ASSETS (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Prepaid Expense and Other Assets, Noncurrent [Abstract]    
Deferred installation expenses [1] $ 2,904 $ 552
Deposits 318 387
Other non-current assets $ 3,222 $ 939
[1] See Note 1W.