v3.26.1
Share-Based Payments - Summary of Number of Shares Outstanding and Weighted Average Grant Date Fair Value (Details)
12 Months Ended
Dec. 31, 2025
shares
€ / shares
Dec. 31, 2024
shares
€ / shares
Dec. 31, 2023
shares
€ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of outstanding instruments as of 01/01/2025 13,367,451    
Option outstanding, granted 6,421,033    
Number of free shares vested (231,992)    
Number of outstanding instruments as of 12/31/2025 16,461,689 13,367,451  
Free Shares [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of outstanding instruments as of 01/01/2025 509,295 1,017,538 909,113
Option outstanding, granted 0 0 342,900
Option outstanding, additional shares due to May 2024 modification   44,650  
Number of free shares vested (231,992) (342,675) (167,433)
Option outstanding, forfeited, cancelled or expired (25,356) (210,219) (67,042)
Number of outstanding instruments as of 12/31/2025 251,946 509,295 1,017,538
Weighted average exercise price per share, beginning balance | € / shares € 2.84 € 6.59 € 11.18
Weighted average exercise price per share, granted | € / shares 0 0 3.08
Weighted average exercise price per share, additional shares due to May 2024 modification | € / shares   1.71  
Weighted average exercise price per share, Vested | € / shares 2.6 11.89 22.45
Weighted average exercise price per share, Cancelled | € / shares 3.21 6 11.4
Weighted average exercise price per share, ending balance | € / shares € 3.02 € 2.84 € 6.59