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SHAREHOLDERS' EQUITY (Schedule Of Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Employees and Directors [Member]    
Number of options    
Options outstanding at beginning of year 7,604,651  
Options granted 1,842,900  
Options exercised 161,536  
Options forfeited 637,432  
Options expired  
Options outstanding at end of year 8,648,583 7,604,651
Exercisable at end of year 5,542,991  
Weighted average exercise price    
Options outstanding at beginning of year $ 5.17  
Options granted 2.98  
Options exercised 1.25  
Options forfeited 6.01  
Options outstanding at end of year 4.72 $ 5.17
Exercisable at end of year $ 4.86  
Weighted average remaining contractual life    
Options outstanding 6 years 11 days 6 years 3 months 8 days
Exercisable at end of year 4 years 3 months 29 days  
Aggregate intrinsic value    
Options outstanding at beginning of year $ 6,535  
Options outstanding at end of year 1,364 $ 6,535
Exercisable at end of year $ 1,364  
Non-employees [Member]    
Number of options    
Options outstanding at beginning of year 736,820  
Options granted 170,000  
Options exercised  
Options forfeited 10,000  
Options expired 103,820  
Options outstanding at end of year 793,000 736,820
Exercisable at end of year 345,500  
Weighted average exercise price    
Options outstanding at beginning of year $ 6.31  
Options granted 3.31  
Options exercised  
Options forfeited 4.65  
Options expired 5.46  
Options outstanding at end of year 5.80 $ 6.31
Exercisable at end of year $ 6.79  
Weighted average remaining contractual life    
Options outstanding 4 years 4 months 20 days 4 years 4 months 17 days
Exercisable at end of year 4 years 1 month 13 days