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Stock-Based Compensation, Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Stock-Based Compensation Expense [Abstract] |  |
Stock-based compensation expense | $ 1,242 | $ 2,935
Research and Development [Member] |  |
Stock-Based Compensation Expense [Abstract] |  |
Stock-based compensation expense | 234 | 1,249
General and Administrative [Member] |  |
Stock-Based Compensation Expense [Abstract] |  |
Stock-based compensation expense | $ 1,008 | $ 1,686

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