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Financial liabilities - Conditional advances (Details) - EUR (€) € in Thousands | 1 Months Ended | 12 Months Ended | 25 Months Ended | 27 Months Ended | 31 Months Ended | 73 Months Ended | 109 Months Ended |  |  |
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Jun. 30, 2024 | Dec. 31, 2019 | Nov. 30, 2019 | Aug. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2016 | Sep. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2019 | Nov. 30, 2019 | Jun. 30, 2016 | Dec. 31, 2022 | Dec. 31, 2022 | Jun. 02, 2017 | Dec. 16, 2016 | Dec. 16, 2013
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conditional advances |  |  |  |  |  |  |  |  |  | € 0 | € 0 | € 6,771 |  |  |  |  |  |  |  |
Income from government grants |  |  |  |  |  |  |  |  |  | 0 | 4,140 | 81 |  |  |  |  |  |  |  |
RNP-VIR conditional advance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum drawdown capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 6,300 |
Proceeds from conditional advances |  |  | € 1,930 | € 346 |  | € 1,756 |  |  |  |  |  |  |  | € 4,032 |  | € 4,032 |  |  |  |
Excess conditional advances claimed | € 1,241 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of conditional advances waived | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conditional advances | € 2,945 |  |  |  |  |  |  |  |  | 0 | 0 | 4,232 |  |  |  |  |  |  |  |
Income from government grants | 1,872 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CARENA conditional advance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum drawdown capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 3,840
Proceeds from conditional advances | € 1,068 |  |  |  |  |  | € 29 | € 1,008 | € 1,150 |  |  |  |  |  | € 2,187 |  | € 2,187 |  |  |
Percentage of conditional advances waived | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conditional advances | € 3,255 |  |  |  |  |  |  |  |  | 0 | 0 | 2,485 |  |  |  |  |  |  |  |
Income from government grants | € 2,251 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ebola conditional advance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum drawdown capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 390 |  |
Proceeds from conditional advances |  | € 90 |  |  | € 300 |  |  |  |  |  |  |  | € 390 |  |  |  |  |  |  |
Conditional advances |  |  |  |  |  |  |  |  |  | € 0 | € 0 | € 55 |  |  |  |  |  |  |  |

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- Definition Other Financial Liabilities, Maximum Drawdown Capacity + References No definition available. + Details
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