v3.26.1
Basic and diluted loss per share - Summary of Earnings Per Share (Detail) - EUR (€)
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Basic And Diluted Earnings Per Share1 [Abstract]        
Net Loss € (47,842,729) € (45,480,686) € (87,043,402) € (91,821,509)
Weighted average number of ordinary shares outstanding 68,072,885 54,688,182 66,696,719 54,588,321
Basic loss per share € (0.7) € (0.83) € (1.31) € (1.68)
Diluted loss per share € (0.7) € (0.83) € (1.31) € (1.68)