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Balance Sheet Components - Schedule of Prepaid and Other Current Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Prepaid research and development contract services | $ 107 | $ 1,206
Advanced professional fees | 238 | 243
Prepaid insurance | 444 | 347
Other prepaid expenses and other current assets | 65 | 101
Total prepaid and other current assets | $ 854 | $ 1,897

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