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SHAREHOLDERS' EQUITY (Schedule Of Stock Compensation Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Stock-based compensation expenses $ 2,408 $ 2,166 $ 2,633
Research and development expenses [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Stock-based compensation expenses 1,151 948 1,331
Marketing and business development expenses [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Stock-based compensation expenses 46 215 187
General and administrative expenses [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Stock-based compensation expenses $ 1,211 $ 1,003 $ 1,115