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SIGNIFICANT ACCOUNTING POLICIES (Schedule Of Stock Option Granted Assumptions) (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]      
Dividend yield 0.00% 0.00% 0.00%
Volatility, minimum 53.00% 51.00% 48.00%
Volatility, maximum 69.00% 73.00% 70.00%
Risk free interest, minimum 0.80% 0.20% 0.10%
Risk free interest, maximum 2.20% 2.10% 2.40%
Early exercise multiple, minimum 2.10 2.20 2.60
Early exercise multiple, maximum 2.20 3.40 3.40