Intangible assets - Summary of Amortization expense (Detail) - EUR (€) € in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of detailed information about intangible assets [line items] | |||
| Amortisation, intangible assets other than goodwill | € (138) | € (182) | € (223) |
| Research and development expenses [Member] | |||
| Disclosure of detailed information about intangible assets [line items] | |||
| Amortisation, intangible assets other than goodwill | (79) | (98) | (115) |
| General and administrative expenses [Member] | |||
| Disclosure of detailed information about intangible assets [line items] | |||
| Amortisation, intangible assets other than goodwill | € (59) | € (84) | € (108) |