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Organization and significant accounting policies (Details) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) reporting_unit reportable_segment | Apr. 04, 2025 | Dec. 31, 2024 USD ($)
Asset Acquisition [Line Items] |  |  |
Number of reportable segments | reportable_segment | 1 |  |
Number of reporting units | reporting_unit | 1 |  |
Cash, cash equivalents, and available-for-sale securities | $ | $ 98.4 |  | $ 109.2
PanTHERA CryoSolutions, Inc. |  |  |
Asset Acquisition [Line Items] |  |  |
Remaining acquired shares percentage |  | 90.00% |

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