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Commitments and contingencies - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 | May 31, 2024 | Mar. 31, 2026 | Dec. 31, 2025 | May 15, 2024
Loss Contingencies [Line Items] |  |  |  |  |
Preferred stock, shares issued |  |  | 78,762,142 | 78,762,142 |
Clinical and regulatory milestone payments |  | $ 200.0 |  |  |
Maximum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Commercial milestone payments |  | $ 5,700.0 |  |  |
Series A-2 Convertible Preferred Stock |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Preferred stock, shares issued |  | 5,677,603 |  |  | 5,677,603
License and collaboration agreement |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Non-refundable upfront payment |  | $ 100.0 |  |  |
Technology transfer fee | $ 10.0 |  |  |  |

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