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Prepaid Expenses And Other Current Assets (Schedule Of Prepaid Expenses And Other Current Assets) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Prepaid Expenses And Other Current Assets [Abstract] |  |
Prepaid insurance | $ 5 | $ 662
Contract research organization and other deposits | 6,801 | 10,330
Other | 163 | 53
Total prepaid expenses and other current assets | $ 6,969 | $ 11,045

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