Operating income - Narrative (Details) - EUR (€) € in Thousands |
1 Months Ended | 3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2024 |
Sep. 30, 2025 |
Sep. 30, 2024 |
Sep. 30, 2025 |
Sep. 30, 2024 |
|
| Disclosure Of Operating Income [Line Items] | |||||
| Research tax credit ("CIR") | € 639 | € 1,332 | € 2,656 | € 3,997 | |
| Subsidies | € 20 | € 4,140 | |||
| 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 | ||||