v3.26.1
Share-based Payments - Summary of assumptions Vesting Details (Details) - Stock Option 1 [Member]
12 Months Ended
Dec. 31, 2025
€ / shares
shares
Dec. 31, 2024
€ / shares
shares
Dec. 31, 2023
€ / shares
shares
Dec. 31, 2023
$ / shares
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Weighted-Average fair values of stock options granted € 0.89 € 1.41 € 1.65  
Share entitlement per option | shares 1   1 1
Vesting conditions Performance & Service or Service only Performance & Service or Service Performance & Service or Service Performance & Service or Service
Vesting period Graded Graded Graded Graded
Top of Range [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Risk-free interest rate 3.06% 2.99% 2.75% 2.75%
Exercise price € 4.07 € 2.82 € 3.17  
Underlying stock price at grant date | (per share) € 4.02 € 2.76   $ 3.09
Expected volatility 72.20% 65.20% 64.40% 64.40%
Expected term (in years) 6.16 6.17 6.15 6.15
Bottom of range [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Risk-free interest rate 2.78% 2.51% 2.45% 2.45%
Share entitlement per option | shares   1.06    
Exercise price € 1.26 € 1.7 € 1.74  
Underlying stock price at grant date | (per share) € 1.26 € 1.67   $ 1.7
Expected volatility 65.00% 64.60% 63.70% 63.70%
Expected term (in years) 5.93 6.03 6.03 6.03