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SHAREHOLDERS' EQUITY (Schedule Of Weighted Average Assumptions) (Details) - Non-employees [Member]
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Share-based Compensation Arrangements by Grantee [Line Items]      
Volatility 52.09% 49.72% 51.00%
Risk-free interest rate 2.21% 1.98% 1.85%
Dividend yield 0.00% 0.00% 0.00%
Expected term 5 years 2 months 23 days 5 years 3 months 15 days 5 years 7 months 6 days