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SHAREHOLDERS' EQUITY (Schedule Of Equity-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Total share-based compensation expense $ 1,662 $ 2,053 $ 1,980
Cost of Revenue [Member]      
Total share-based compensation expense 110 71 42
Research And Development Expense [Member]      
Total share-based compensation expense 243 366 313
Selling And Marketing Expense [Member]      
Total share-based compensation expense 545 708 640
General And Administrative Expense [Member]      
Total share-based compensation expense $ 764 $ 908 $ 985