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Balance Sheet Items - Schedule of Prepaid Expenses and Other Current Asset (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Prepaid expenses | $ 196 | $ 642
Prepaid research and development costs | 11 | 29
Other current assets | 355 | 535
Total | $ 562 | $ 1,206

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