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Summary of Significant Accounting Policies - Prepaid expenses and other current assets (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Summary of Significant Accounting Policies |  |
Prepaid research and development costs | $ 2,259 | $ 4,392
Other current assets | 6,672 | 7,415
Prepaid expenses and other current assets | $ 8,931 | $ 11,807

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