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SHAREHOLDERS' EQUITY (Schedule Of Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Employees and Directors [Member]    
Number of options    
Options outstanding at beginning of year 8,202,438  
Options granted 1,513,000  
Options exercised (878,378)  
Options forfeited (1,609,382)  
Options expired (3,333)  
Options outstanding at end of year 7,224,345 8,202,438
Exercisable at end of year 4,165,052  
Weighted average exercise price    
Options outstanding at beginning of year $ 4.69  
Options granted 3.46  
Options exercised 3.70  
Options forfeited 5.08  
Options expired 2.46  
Options outstanding at end of year 4.47 $ 4.69
Exercisable at end of year $ 5.24  
Weighted average remaining contractual life    
Options outstanding 5 years 11 months 12 days 5 years 11 months 19 days
Exercisable at end of year 4 years 1 month 13 days  
Aggregate intrinsic value    
Options outstanding at beginning of year  
Options outstanding at end of year 12,816
Exercisable at end of year $ 4,961  
Non-employees [Member]    
Number of options    
Options outstanding at beginning of year 768,000  
Options granted 280,000  
Options exercised  
Options forfeited (130,000)  
Options expired (40,000)  
Options outstanding at end of year 878,000 768,000
Exercisable at end of year 430,500  
Weighted average exercise price    
Options outstanding at beginning of year $ 5.57  
Options granted 3.83  
Options exercised  
Options forfeited 5.87  
Options expired 6.38  
Options outstanding at end of year 4.93 $ 5.57
Exercisable at end of year $ 6.06  
Weighted average remaining contractual life    
Options outstanding 3 years 3 months 26 days 3 years 7 months 24 days
Exercisable at end of year 1 year 8 months 5 days  
Aggregate intrinsic value    
Options outstanding at beginning of year  
Options outstanding at end of year 1,126
Exercisable at end of year $ 165