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Operating expenses - Schedule of Selling, General and Administrative 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, fees and other expenses | € (4,334) | € (4,183)
Payroll costs (including share-based payments) | (7,040) | (6,336)
Depreciation, amortization and provision expenses | 80 | (301)
Total SG&A expenses | € (11,294) | € (10,819)

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