General and administrative expenses - Additional Information (Detail) - EUR (€) € in Millions |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Disclosure Of Detailed Information General And Administrative Expenses [Abstract] | ||
| Depreciation expenses related to property, plant and equipment and short-term leases | € 0.3 | € 0.2 |