Cash and cash equivalents - Narrative (Details) - EUR (€) € in Thousands |
6 Months Ended | 12 Months Ended | |
|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Disclosure Of Cash And Cash Equivalents [Line Items] | |||
| Notice accounts | € 66,120 | € 5,744 | |
| Effect of movements in exchange rates on cash held | 6,206 | € (1,785) | |
| United States of America, Dollars | |||
| Disclosure Of Cash And Cash Equivalents [Line Items] | |||
| Effect of movements in exchange rates on cash held | € 2,736 | € (8,639) | |