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Operating expenses - Schedule of Research and Development Expenses (Details) - EUR (€) € in Thousands | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Analysis of income and expense [abstract] |  |
Purchases, sub-contracting and other expenses | € (7,489) | € (15,105)
Payroll costs (including share-based payments) | (6,430) | (6,199)
Depreciation, amortization, and provision expenses | (610) | (682)
Total research and development expenses | € (14,529) | € (21,987)

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