Financial liabilities - Lease liabilities (Details) - EUR (€) € in Thousands |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Disclosure Of Lease Liabilities [Line Items] | |||||
| Expense on lease liabilities | € 601 | € 428 | |||
| Depreciation expense, lease | 559 | 362 | |||
| Interest expense on lease liabilities | € 11 | € 17 | 24 | 36 | |
| Expense relating to short-term leases | € 1 | € 175 | |||
| Lease facilities | |||||
| Disclosure Of Lease Liabilities [Line Items] | |||||
| Lease liability, percentage of total | 70.00% | 70.00% | 70.00% | ||