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SHAREHOLDERS' EQUITY (Schedule Of Equity-Based Compensation Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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