v3.26.1
Share capital and share based payments - Disclosure of Breakdown of Expenses per Financial Year (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Share-based compensation € 2,567 € 3,944 € 4,256
AGAP Employee 2020 / AGAP Management 2020      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Share-based compensation 0 0 1,436
AGAP Employee 2021 / AGAP Management 2021      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Share-based compensation 0 1,162 1,161
AGAP Employee 2022 / AGAP Management 2022      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Share-based compensation 891 888 1,157
AGA New Members 2023-1 Management      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Share-based compensation 19 19 3
AGAP Employee 2023/ AGAP Management 2023      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Share-based compensation 702 1,226 33
AGA "Plan Epargne Entreprise" 2023      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Share-based compensation 0 0 465
AGA Perf Management 2024-1      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Share-based compensation 0 302 0
AGAP Employee 2024/ AGAP Management 2024      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Share-based compensation 699 119 0
AGA "Plan Epargne Entreprise" 2024      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Share-based compensation 0 168 0
AGA New Members 2024 - 1 Management      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Share-based compensation (17) 17 0
Stock-option 2024      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Share-based compensation (12) 12 0
Other free shares      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Share-based compensation 231 32 0
AGA Employee 2025      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Share-based compensation € 54 € 0 € 0