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Summary of Significant Accounting Policies (Schedule Of Stock-Based Compensation Expense By Statement Of Operations) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based employee compensation expense | $ 1,288 | $ 1,223 | $ 1,007
Cost of product revenue |  |  |
Share-based employee compensation expense | 39 | 37 | 19
Research and development expense |  |  |
Share-based employee compensation expense | 546 | 350 | 282
Sales, marketing, general and administrative expense |  |  |
Share-based employee compensation expense | $ 703 | $ 836 | $ 706

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