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Loss per share - Schedule of Basic and Diluted Loss Per Share (Details) - EUR (€)
€ / shares in Units, € in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings per share [abstract]      
Net loss for the period (in thousands of euros) € (68,132) € (39,700) € (57,041)
Weighted average number of shares (in shares) 47,265,189,000 36,928,161,000 34,851,868,000
Basic loss per share (in euro per share) € (1.44) € (1.08) € (1.64)
Diluted loss per share (in euro per share) € (1.44) € (1.08) € (1.64)