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CONSOLIDATED STATEMENTS OF INCOME (LOSS) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Profit or loss [abstract]      
Other operating income € 4,570 € 12,449 € 4,621
Total operating income 4,570 12,449 4,621
Sales and marketing (5,194) (5,954) (6,431)
Research and development (177,761) (146,532) (103,176)
General and administrative (67,670) (32,946) (22,390)
Total operating expenses (250,626) (185,433) (131,997)
Operating loss (246,056) (172,984) (127,376)
Financial expenses (111,743) (16,991) (27,875)
Financial income 27,545 13,732 7,511
Financial gain (loss) (84,198) (3,258) (20,364)
Net loss before tax (330,254) (176,242) (147,740)
Income tax (5,848) 0 0
Net loss for the period € (336,102) € (176,242) € (147,740)
Loss per share (€/share)      
Weighted average number of outstanding shares used for computing basic loss per share (in shares) 69,527,315 63,046,350 43,066,012
Weighted average number of outstanding shares used for computing diluted loss per share (in shares) 69,527,315 63,046,350 43,066,012
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)