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Segment Reporting - Summary of Operating Costs and Expenses (Parenthetical) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Amortization expense | $ 349 |  | $ 1,036 | $ 0
Depreciation expense |  |  | 19 | 23
Research and Development |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Share-based payment expense | 15 | $ 25 | 50 | 147
Depreciation expense | 2 | 5 | 7 | 14
General and Administration |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Share-based payment expense | 38 | 43 | 120 | 127
Depreciation expense | 4 | $ 3 | 12 | $ 9
Pfizer Intangible Asset |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Amortization expense | $ 349 |  | $ 1,036 |

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