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Income taxes - Schedule of Tax Losses Carried Forward for Which No Deferred Tax Assets (Details) - EUR (€) € in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Disclosure Of Detailed Information About Unused Tax Losses For Which No Deferred Tax Asset Recognised [Line Items] |  |
Unused tax losses for which no deferred tax asset recognised | € 279,744 | € 266,578
Expiry within 1 year |  |
Disclosure Of Detailed Information About Unused Tax Losses For Which No Deferred Tax Asset Recognised [Line Items] |  |
Unused tax losses for which no deferred tax asset recognised | 9,793 | 13,462
Expiry 1-5 years |  |
Disclosure Of Detailed Information About Unused Tax Losses For Which No Deferred Tax Asset Recognised [Line Items] |  |
Unused tax losses for which no deferred tax asset recognised | 15,211 | 36,787
Expiry over 5 years |  |
Disclosure Of Detailed Information About Unused Tax Losses For Which No Deferred Tax Asset Recognised [Line Items] |  |
Unused tax losses for which no deferred tax asset recognised | 27,022 | 39,319
No expiration |  |
Disclosure Of Detailed Information About Unused Tax Losses For Which No Deferred Tax Asset Recognised [Line Items] |  |
Unused tax losses for which no deferred tax asset recognised | € 227,718 | € 177,010

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