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Prepaid Expenses And Other Current Assets (Schedule Of Prepaid Expenses And Other Current Assets) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Prepaid Expenses And Other Current Assets [Abstract] |  |
Prepaid insurance | $ 5 | $ 874
Contract research organization and other deposits | 4,527 | 9,177
Interest receivable | 1,328 |
Other | 235 | 160
Total prepaid expenses and other current assets | $ 6,095 | $ 10,211

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