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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, 2020 | Dec. 31, 2019
Share-based employee compensation expense | $ 1,297 | $ 1,614
Cost of product revenue |  |
Share-based employee compensation expense | 0 | 26
Research and development expense |  |
Share-based employee compensation expense | 699 | 379
Sales, marketing, general and administrative expense |  |
Share-based employee compensation expense | $ 598 | $ 1,209

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