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Operating expenses - Disclosure of principal audit fees and services (Details) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Expenses by nature [abstract] |  |  |
Audit fees | € 1,255 | € 1,144 | € 1,848
Audit-related fees | 129 | 82 |
Tax fees |  |  |
All other fees | 34 | 7 | 492
Total auditor's remuneration | € 1,418 | € 1,233 | € 2,340

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