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Trade receivables and others - Disclosure of trade receivables and others (Details) € in Thousands |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2022 loan | Jun. 30, 2024 EUR (€) loan_agreement | Dec. 31, 2023 EUR (€) | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 EUR (€)
Disclosure of financial assets [Line Items] |  |  |  |  |
Other receivables |  | € 97 | € 104 |  |
Research tax credit |  | 12,755 | 29,755 |  |
Other tax credits |  | 0 | 361 |  |
Prepaid expenses, current |  | 3,009 | 5,692 |  |
VAT refund |  | 583 | 1,037 |  |
Trade account receivables |  | 393 | 15,233 |  |
Prepayments made to suppliers |  | 2,957 | 3,374 |  |
Receivables and others |  | 19,795 | 55,557 |  |
Research tax credit, non-current |  | 13,850 | 9,800 |  |
Prepaid expenses, non-current |  | 628 | 754 |  |
Receivables and others - non-current |  | 14,478 | 10,554 |  |
Trade receivables and others |  | 34,273 | 66,111 |  |
Income from research tax credit 2019 and 2020, maturity |  |  |  |  | 3 years
Income from research tax credit 2019 |  |  |  |  | € 16,737
Income from research tax credit 2020 |  |  |  | € 13,018 |
Offset of restated income from research tax credit |  | 263 |  |  |
Income from research tax credit 2023 |  |  | 9,800 |  |
Income from research tax credit HY 2024 |  | € 4,050 |  |  |
Carry-back tax receivable |  |  | 333 |  |
Agreement With Sanofi |  |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |  |
Trade account receivables |  |  | 15,000 |  |
State guaranteed loan, Societe Generale and BNP Paribas |  |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |  |
Borrowing, number of loan agreement | 2 | 2 |  |  |
Borrowing, maturity | 5 years | 5 years |  |  |
Guarantees |  |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |  |
Prepaid expenses, current |  | € 879 | € 1,005 |  |

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