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OTHER NON-CURRENT ASSETS (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Prepaid Expense and Other Assets, Noncurrent [Abstract]    
Non-current deferred installation expenses [1] $ 2,674 $ 3,049
Deposits 279 316
Other non-current assets $ 2,953 $ 3,365
[1] See Note 1W.