Other receivables and assets - Narrative (Details) - EUR (€) € in Thousands |
6 Months Ended | 142 Months Ended | |
|---|---|---|---|
Jun. 30, 2025 |
Sep. 30, 2025 |
Dec. 31, 2024 |
|
| Disclosure Of Other Receivables And Other Assets [Line Items] | |||
| Proceeds from research tax credit | € 5,640 | € 41,300 | |
| Research tax credit ("CIR") | 2,791 | € 5,774 | |
| Employee-related receivables | 5,362 | € 0 | |
| Current prepaid expenses related to CRO | 1,171 | ||
| Current advances to suppliers | 1,534 | ||
| 2025, Tax Year | |||
| Disclosure Of Other Receivables And Other Assets [Line Items] | |||
| Research tax credit ("CIR") | € 2,791 |