Cash and cash equivalents - Narrative (Details) - EUR (€) € in Thousands |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Dec. 31, 2025 |
|
| Disclosure Of Cash And Cash Equivalents [Line Items] | |||
| Notice accounts | € 4,147 | € 5,744 | |
| Effect of movements in exchange rates on cash held | (7,415) | € 700 | |
| United States of America, Dollars | |||
| Disclosure Of Cash And Cash Equivalents [Line Items] | |||
| Effect of movements in exchange rates on cash held | € (2,500) | € 8,639 | |