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Loss per share - Schedule of Basic and Diluted Loss Per Share (Details) - EUR (€)
€ / shares in Units, € in Thousands
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Earnings per share [abstract]    
Net loss for the period (in thousands of euros) € (5,383) € (21,872)
Weighted average number of shares (in shares) 47,418,155 47,124,112
Basic loss per share (in euro per share) € (0.11) € (0.46)
Diluted loss per share (in euro per share) € (0.11) € (0.46)