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SHAREHOLDERS' EQUITY (Schedule Of Equity-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Total stock-based compensation expense $ 1,071 $ 1,625 $ 3,345
Cost of Revenue [Member]      
Total stock-based compensation expense 30 73 215
Research And Development Expense [Member]      
Total stock-based compensation expense 151 736 1,625
Selling And Marketing Expense [Member]      
Total stock-based compensation expense 369 495 674
General And Administrative Expense [Member]      
Total stock-based compensation expense $ 521 $ 321 $ 831