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Other financial assets - Narrative (Details) - EUR (€) € in Thousands | 1 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2024 | Jun. 30, 2023 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of financial assets [line items] |  |  |  |  |  |
Advances related to CRO contracts |  |  | € 4,665 | € 4,929 | € 12,172 | € 12,187
Disount rate applied to long-term advances | 6.83% |  |  |  |  |
Cash advances and loans made to CRO | € 5,538 | € 1,620 |  |  |  |
Bottom of range |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |
Disount rate applied to long-term advances |  | 7.09% |  |  |  | 0.19%
Top of range |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |
Disount rate applied to long-term advances |  | 7.59% |  |  |  | 7.16%

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