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SHAREHOLDERS' EQUITY (Summary Of Stock Options And RSUs Granted) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Number of options    
Outstanding at beginning of year 7,490,173  
Granted 1,269,054  
Exercised (237,410)  
Forfeited or expired (581,839)  
Outstanding at end of year 7,939,978 7,490,173
Options exercisable at end of the year 4,902,815  
Vested and expected to vest 7,427,645  
Weighted average exercise price    
Outstanding at beginning of year $ 3.86  
Granted 2.39  
Exercised 1.19  
Forfeited or expired 5.15  
Outstanding at end of year 3.61 $ 3.86
Options exercisable at end of the year 4.78  
Vested and expected to vest $ 3.73  
Weighted-average remaining contractual term    
Outstanding at end of year 3 years 9 months 4 years 3 months 29 days
Options exercisable at end of the year 3 years 3 months 15 days  
Vested and expected to vest 3 years 8 months 5 days  
Aggregate intrinsic value    
Outstanding at beginning of year $ 6,003  
Outstanding at end of the year 2,839 $ 6,003
Options exercisable at end of the year 1,552  
Vested and expected to vest $ 2,654  
RSU [Member]    
Number of options    
Outstanding at beginning of year 47,535  
Granted 316,827  
Exercised (37,269)  
Outstanding at end of year 327,093 47,535
Vested and expected to vest 228,536  
Aggregate intrinsic value    
Outstanding at beginning of year $ 125  
Outstanding at end of the year 648 $ 125
Vested and expected to vest $ 453