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SHAREHOLDERS' EQUITY (Schedule Of Equity-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Total stock-based compensation expense $ 1,203 $ 1,071 $ 1,625
Cost of Revenue [Member]      
Total stock-based compensation expense 54 30 73
Research And Development Expense [Member]      
Total stock-based compensation expense 229 151 736
Selling And Marketing Expense [Member]      
Total stock-based compensation expense 292 369 495
General And Administrative Expense [Member]      
Total stock-based compensation expense $ 628 $ 521 $ 321