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Related party transactions - Compensation of key management personnel (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]      
Short-term employee benefits | € € 3,184 € 2,531 € 2,554
Post-employment benefits | € 25 65 73
Total | € € 3,209 € 2,596 € 2,627
Key management personnel      
Disclosure of transactions between related parties [line items]      
Warrants granted | shares 25,000   350,000
Warrants forfeited | shares (25,000)    
Warrants outstanding | shares 350,000 350,000 350,000