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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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