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SHAREHOLDERS' EQUITY (Summary Of Stock Options Granted) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Number of options    
Outstanding at beginning of year 7,075,600  
Granted 1,241,930  
Exercised (851,958)  
Forfeited or expired (1,226,843)  
Outstanding at end of year 6,238,729 7,075,600
Options exercisable at end of the year 4,017,763  
Vested and expected to vest 5,806,504  
Weighted average exercise price    
Outstanding at beginning of year $ 3.64  
Granted 2.32  
Exercised 1.44  
Forfeited or expired 4.36  
Outstanding at end of year 3.52 $ 3.64
Options exercisable at end of the year 4.05  
Vested and expected to vest $ 3.59  
Weighted-average remaining contractual term    
Outstanding at end of year 3 years 2 months 1 day 3 years 3 months 18 days
Options exercisable at end of the year 2 years 2 months 8 days  
Vested and expected to vest 3 years 7 days  
Aggregate intrinsic value    
Outstanding at beginning of year $ 1,366  
Outstanding at end of the year 2,654 $ 1,366
Options exercisable at end of the year 1,938  
Vested and expected to vest $ 2,502