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SIGNIFICANT ACCOUNTING POLICIES (Schedule Of Stock Option Granted Assumptions) (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Dividend yield 0.00% 0.00% 0.00%
Volatility, minimum 60.00% 53.00% 53.00%
Volatility, maximum 85.00% 65.00% 62.00%
Risk free interest, minimum 0.10% 1.20% 1.80%
Risk free interest, maximum 1.00% 2.70% 2.90%
Early exercise multiple, minimum 1.5 1.3 2.0
Early exercise multiple, maximum 1.6 2.3 2.3