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Related party transactions - Narrative (Details) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 EUR (€) shares | Dec. 31, 2024 EUR (€) shares | Dec. 31, 2023 EUR (€) shares
Disclosure of transactions between related parties [line items] |  |  |
Share based payment expense related to key management | € | € 266 | € 285 | € 47
Key management personnel |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Warrants granted | 25,000 |  | 350,000
Warrants outstanding | 350,000 | 350,000 | 350,000
Warrants forfeited | 25,000 |  |
Lunebeke NV |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Rental expense | € | € 314 | € 119 | € 97

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