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Other operating income - Narrative (Details) - EUR (€) € in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure Of Operating Income [Line Items] |  |  |  |
Research tax credit ("CIR") |  | € 3,061 | € 6,651 | € 4,493
Subsidies |  | 0 | 4,140 | 81
Other |  | 0 | 23 | 47
RNP-VIR conditional advance |  |  |  |
Disclosure Of Operating Income [Line Items] |  |  |  |
Subsidies | € 1,872 |  |  |
CARENA conditional advance |  |  |  |
Disclosure Of Operating Income [Line Items] |  |  |  |
Subsidies | € 2,251 |  |  |
Tax Year 2021 |  |  |  |
Disclosure Of Operating Income [Line Items] |  |  |  |
Research tax credit ("CIR") |  |  | 984 |
Tax Year 2022 |  |  |  |
Disclosure Of Operating Income [Line Items] |  |  |  |
Research tax credit ("CIR") |  |  |  | € 4,493
Tax Year 2023 |  |  |  |
Disclosure Of Operating Income [Line Items] |  |  |  |
Research tax credit ("CIR") |  |  | € 5,668 |
Tax Year 2024 |  |  |  |
Disclosure Of Operating Income [Line Items] |  |  |  |
Research tax credit ("CIR") |  | € 3,197 |  |

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