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Net financial income (loss) - Schedule of Net Financial Income (Loss) (Details) - EUR (€) € in Thousands | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Net Financial Income (Loss) [Abstract] |  |
Income from cash and cash equivalents | € 598 | € 1,499
Foreign exchange gains | 47 | 1,888
Total financial income | 645 | 3,386
Interest costs | (4,174) | (3,772)
Net impact of accretion, discounting and catch-up on EIB loan | 1,036 | 2,722
Lease debt interests | (69) | (89)
Foreign exchange losses | (3,624) | (324)
Total financial expenses | (6,831) | (1,463)
Financial income (loss) | € (6,186) | € 1,924

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