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Income taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2017
Income Taxes |  |  |  |
Cash paid for taxes |  | $ 0.9 | $ 0.8 |
Domestic Tax Jurisdiction |  |  |  |
Income Taxes |  |  |  |
Net operating loss (NOL) carryforwards | $ 597.7 |  |  |
Operating loss carryforwards, not subject to expiry |  |  |  | $ 486.6
Domestic Tax Jurisdiction | Research Tax Credit Carryforward |  |  |  |
Income Taxes |  |  |  |
Increased in unrecognized tax benefits | 9.8 |  |  |
Domestic Tax Jurisdiction | Through Tax Year 2037 |  |  |  |
Income Taxes |  |  |  |
Operating loss carryforwards, subject to expiry |  |  |  | $ 111.1
Domestic Tax Jurisdiction | Through Tax Year 2045 |  |  |  |
Income Taxes |  |  |  |
Tax credit carryforwards | 13.2 |  |  |
State and Local Jurisdiction |  |  |  |
Income Taxes |  |  |  |
Net operating loss (NOL) carryforwards | 374.4 |  |  |
Operating loss carryforwards, not subject to expiry | 26.0 |  |  |
State and Local Jurisdiction | Research Tax Credit Carryforward |  |  |  |
Income Taxes |  |  |  |
Increased in unrecognized tax benefits | 9.8 |  |  |
State and Local Jurisdiction | Through Tax Year 2045 |  |  |  |
Income Taxes |  |  |  |
Operating loss carryforwards, subject to expiry | 348.4 |  |  |
State and Local Jurisdiction | Through Tax Year 2040 |  |  |  |
Income Taxes |  |  |  |
Tax credit carryforwards | $ 6.6 |  |  |

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