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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

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