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SIGNIFICANT ACCOUNTING POLICIES (Schedule Of Stock Option Granted Assumptions) (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]      
Dividend yield 0.00% 0.00% 0.00%
Volatility, minimum 51.00% 48.00% 49.00%
Volatility, maximum 73.00% 70.00% 65.00%
Risk free interest, minimum 0.20% 0.10% 0.10%
Risk free interest, maximum 2.10% 2.40% 2.40%
Early exercise multiple, minimum 2.20 2.60 2.20
Early exercise multiple, maximum 3.40 3.40 2.80