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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, 2018
Dec. 31, 2017
Number of options    
Outstanding at beginning of year 7,939,978  
Granted 1,273,145  
Exercised (1,930,244)  
Forfeited or expired (531,273)  
Outstanding at end of year 6,751,606 7,939,978
Options exercisable at end of the year 4,150,587  
Vested and expected to vest 6,325,305  
Weighted average exercise price    
Outstanding at beginning of year $ 3.61  
Granted 3.33  
Exercised 1.44  
Forfeited or expired 6.00  
Outstanding at end of year 3.99 $ 3.61
Options exercisable at end of the year 4.97  
Vested and expected to vest $ 4.09  
Weighted-average remaining contractual term    
Outstanding at end of year 3 years 5 months 20 days 3 years 9 months
Options exercisable at end of the year 2 years 9 months 3 days  
Vested and expected to vest 3 years 4 months 9 days  
Aggregate intrinsic value    
Outstanding at beginning of year $ 2,839  
Outstanding at end of the year 7,937 $ 2,839
Options exercisable at end of the year 4,517  
Vested and expected to vest $ 7,501  
RSU [Member]    
Number of options    
Outstanding at beginning of year 327,093  
Granted 186,608  
Exercised (112,665)  
Forfeited or expired (24,225)  
Outstanding at end of year 376,811 327,093
Vested and expected to vest 264,496  
Aggregate intrinsic value    
Outstanding at beginning of year $ 648  
Outstanding at end of the year 1,424 $ 648
Vested and expected to vest $ 1,000