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Revenues and other income - Schedule of Revenues and Other Income (Details) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | € (11,609) | € 30,058 | € 0
Research tax credit | 3,300 | 3,939 | 4,091
Subsidies | 89 | 229 | 135
Other | 1,029 | 1,981 | 550
Other income | 4,419 | 6,150 | 4,776
Total revenues and other income | (7,191) | 36,207 | 4,776
Services |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | (17,534) | 29,750 | 0
Other sales |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | € 5,924 | € 308 | € 0

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