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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Jan. 30, 2017
Dec. 31, 2016
Business Acquisition, Contingent Consideration [Line Items]      
Fair value of contingent consideration in investment $ 1,550  
Seculert Ltd [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Fair value of contingent consideration in investment $ 1,550 $ 1,981  
Contingent consideration discount rate 16.00%    
Net income $ 431