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Share-based payment plans - Black-Scholes model (Details)
12 Months Ended
Dec. 31, 2025
Y
€ / shares
Share-based payment plans  
Return dividend 0.00%
Plan 2023 (Mar 25)  
Share-based payment plans  
Return dividend 0.00%
Expected volatility 66.00%
Risk-free interest rate 3.06%
Expected life | Y 4.22
Exercise price (in EUR) € 7.59
Stock price (in EUR) 5.38
Fair value warrant € 2.43
Plan 2023 (Nov 23)  
Share-based payment plans  
Return dividend 0.00%
Expected volatility 64.00%
Risk-free interest rate 3.19%
Expected life | Y 5.59
Exercise price (in EUR) € 5.09
Stock price (in EUR) 5.6
Fair value warrant € 3.44
Plan 2023 (Oct 23)  
Share-based payment plans  
Return dividend 0.00%
Expected volatility 64.00%
Risk-free interest rate 3.50%
Expected life | Y 5.59
Exercise price (in EUR) € 4.87
Stock price (in EUR) 5.15
Fair value warrant € 3.12
Plan 2015 (Sept 16)  
Share-based payment plans  
Return dividend 0.00%
Expected volatility 47.00%
Risk-free interest rate 0.24%
Expected life | Y 4.3
Exercise price (in EUR) € 6.45
Stock price (in EUR) 6.42
Fair value warrant € 2.41
IPO 2015 (Nov)  
Share-based payment plans  
Return dividend 0.00%
Expected volatility 47.00%
Risk-free interest rate 1.17%
Expected life | Y 5.5
Exercise price (in EUR) € 8.81
Stock price (in EUR) 8.08
Fair value warrant € 3.3
IPO 2014 (Nov)  
Share-based payment plans  
Return dividend 0.00%
Expected volatility 50.00%
Risk-free interest rate 1.12%
Expected life | Y 5.5
Exercise price (in EUR) € 8.81
Stock price (in EUR) 8.67
Fair value warrant € 3.94
IPO 2014 (June)  
Share-based payment plans  
Return dividend 0.00%
Expected volatility 46.00%
Risk-free interest rate 1.70%
Expected life | Y 5.5
Exercise price (in EUR) € 8.81
Stock price (in EUR) 8.81
Fair value warrant € 3.83