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Income / (loss) per share - Summary of income (loss) per share (Details) - EUR (€) € / shares in Units, € in Thousands | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Income (Loss) Per Share [Abstract] |  |
Net income (loss) | € (24,764) | € 1,718
Weighted average number of ordinary shares in circulation (in shares) | 80,872,369 | 80,319,897
Basic income (loss) per share (in EUR per share) | € (0.31) | € 0.02
Adjustment for share instruments (in shares) | 5,026,389 | 3,461,439
Diluted income/(loss) per share (in EUR per share) | € (0.31) | € 0.02

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