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SHAREHOLDERS' EQUITY (Summary Of Stock Options And RSUs Granted) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Stock Options and Restricted Stock Units [Member]    
Number of awards    
Outstanding at beginning of year 7,939,978  
Granted 432,401  
Exercised (314,384)  
Forfeited or expired (250,505)  
Outstanding at end of the period 7,807,490 7,939,978
Options exercisable at end of the period 5,025,948  
Vested and expected to vest 7,402,176  
Weighted average exercise price    
Outstanding at beginning of year $ 3.61  
Granted 3.00  
Exercised 1.75  
Forfeited or expired 6.52  
Outstanding at end of the period 3.56 $ 3.61
Options exercisable at end of the period 4.48  
Vested and expected to vest $ 3.67  
Weighted-average remaining contractual term    
Outstanding at end of year/period 3 years 5 months 5 days 3 years 9 months
Options exercisable at end of the period 2 years 10 months 10 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 period 10,386 $ 2,839
Options exercisable at end of the period 5,940  
Vested and expected to vest $ 9,778  
Restricted Stock Units RSUs [Member]    
Number of awards    
Outstanding at beginning of year 327,093  
Granted  
Vested (10,816) (37,269)
Forfeited or expired (13,150)  
Outstanding at end of the period 303,127 327,093
Vested and expected to vest 220,420  
Aggregate intrinsic value    
Outstanding at beginning of year $ 648  
Outstanding at end of the period 1,082 $ 648
Vested and expected to vest $ 787