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Other operating income - Disclosure of breakdown of operating income (Details) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Revenue [abstract] |  |  |
Research tax credit ("CIR") | € 3,061 | € 6,651 | € 4,493
Subsidies | 0 | 4,140 | 81
Depositary service fees | 1,509 | 1,634 | 0
Other | 0 | 23 | 47
Total operating income | € 4,570 | € 12,449 | € 4,621

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