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Income (loss) per share - Schedule of earnings per share (Details) - EUR (€)
€ / shares in Units, € in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Earnings per share [abstract]      
Weighted average number of outstanding shares, basic loss per share (in shares) 69,527,315 63,046,350 43,066,012
Weighted average number of outstanding shares, diluted loss per share (in shares) 69,527,315 63,046,350 43,066,012
Net loss for the period € (336,102) € (176,242) € (147,740)
Basic loss per share (in euro per share) € (4.83) € (2.80) € (3.43)
Diluted loss per share (in euro per share) € (4.83) € (2.80) € (3.43)