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Financial assets and liabilities (Details) € in Thousands | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€) | Aug. 22, 2023 EUR (€) | Dec. 31, 2022 EUR (€)
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Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial assets | € 205,228 | € 327,062 | [1] |  | € 75,544 | [1]
Financial assets, at fair value | 176,754 | 301,500 |  |  | 47,452 |
Financial liabilities, at fair value | € 162,256 | 125,191 |  |  | € 58,469 |
Discounted cash flow |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Percentage of reasonably possible increase in unobservable input, liabilities | 1.00% |  |  |  |  |
Credit spread | Discounted cash flow |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Percentage of reasonably possible increase in unobservable input, assets | 1.00% |  |  |  |  |
Percentage of reasonably possible increase in unobservable input, liabilities | 1.00% |  |  |  | 1.00% |
Financial liabilities-non current portion |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial liabilities, at fair value | € 73,497 | 40,622 |  |  | € 9,439 |
Financial liabilities-current portion |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial liabilities, at fair value | 44,935 | 37,348 |  |  | 33,555 |
Trade payables and other current liabilities |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial liabilities, at fair value | 43,824 | 47,221 |  |  | 15,475 |
LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial liabilities, at fair value | 24,803 | 30,037 |  |  | 566 |
LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS | Financial liabilities-non current portion |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial liabilities, at fair value | 3,620 | 18,506 |  |  | 566 |
LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS | Financial liabilities-current portion |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial liabilities, at fair value | 21,183 | 11,531 |  |  | 0 |
LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS | Trade payables and other current liabilities |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial liabilities, at fair value | 0 | 0 |  |  | 0 |
LIABILITIES AT AMORTIZED COST |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial liabilities, at fair value | 137,453 | 95,154 |  |  | 57,903 |
LIABILITIES AT AMORTIZED COST | Financial liabilities-non current portion |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial liabilities, at fair value | 69,877 | 42,768 |  |  | 8,873 |
LIABILITIES AT AMORTIZED COST | Financial liabilities-current portion |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial liabilities, at fair value | 23,752 | 5,165 |  |  | 33,555 |
LIABILITIES AT AMORTIZED COST | Trade payables and other current liabilities |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial liabilities, at fair value | 43,824 | 47,221 |  |  | 15,475 |
ASSETS AT FAIR VALUE THROUGH PROFIT AND LOSS |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial assets, at fair value | 0 | 0 |  |  | 0 |
ASSETS AT AMORTIZED COST |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial assets, at fair value | 176,754 | 301,500 |  |  | 47,452 |
Recurring fair value measurement |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial assets | 177,537 | 301,161 |  |  | 47,889 |
Financial liabilities | 157,828 | 124,266 |  |  | 65,272 |
Recurring fair value measurement | Financial liabilities-non current portion |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial liabilities | € 69,069 | 39,697 |  |  | € 16,241 |
Recurring fair value measurement | Kreos 1 & 2 bond loans | Credit spread | Discounted cash flow |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Significant unobservable input, liabilities |  |  |  |  | 0.1475 |
Decrease in financial liabilities at fair value |  |  |  |  | € 68 |
Recurring fair value measurement | Oceane | Credit spread | Discounted cash flow |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Decrease in financial liabilities at fair value |  |  |  |  | € 476 |
Recurring fair value measurement | Kreos / Claret convertible notes (OCABSA) | Credit spread | Discounted cash flow |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Decrease in financial liabilities at fair value |  | € 538 |  | € 624 |  |
Recurring fair value measurement | Kreos & Claret Financing, Tranche A,B and C | Credit spread | Discounted cash flow |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Significant unobservable input, liabilities | 0.0750 | 0.0900 |  | 0.0960 |  |
Decrease in financial liabilities at fair value | € 958 |  |  |  |  |
Recurring fair value measurement | Conditional advances and PGE loan | Credit spread | Discounted cash flow |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Significant unobservable input, liabilities | 0.0730 | 0.0900 |  |  | 0.1475 |
Recurring fair value measurement | PGE | Credit spread | Discounted cash flow |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Decrease in financial liabilities at fair value | € 21 | € 39 |  |  | € 55 |
Recurring fair value measurement | RNP-VIR conditional advance | Credit spread | Discounted cash flow |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Decrease in financial liabilities at fair value |  | 15 |  |  | 31 |
Recurring fair value measurement | CARENA conditional advance | Credit spread | Discounted cash flow |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Decrease in financial liabilities at fair value |  | 37 |  |  | 37 |
Recurring fair value measurement | Ebola conditional advance | Credit spread | Discounted cash flow |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Decrease in financial liabilities at fair value |  | 1 |  |  | 1 |
Recurring fair value measurement | Financial liabilities-current portion |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial liabilities | 44,935 | 37,348 |  |  | 33,555 |
Recurring fair value measurement | Trade payables and other current liabilities |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial liabilities | 43,824 | 47,221 |  |  | 15,475 |
Other financial assets |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial assets, at fair value | 12,690 | 22,394 |  |  | 11,271 |
Other financial assets | ASSETS AT FAIR VALUE THROUGH PROFIT AND LOSS |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial assets, at fair value | 0 | 0 |  |  | 0 |
Other financial assets | ASSETS AT AMORTIZED COST |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial assets, at fair value | 12,690 | 22,394 |  |  | 11,271 |
Other financial assets | Recurring fair value measurement |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial assets | 13,473 | 22,055 |  |  | 11,708 |
Other receivables and assets |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial assets, at fair value | 19,843 | 27,164 |  |  | 9,231 |
Other receivables and assets | ASSETS AT FAIR VALUE THROUGH PROFIT AND LOSS |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial assets, at fair value | 0 | 0 |  |  | 0 |
Other receivables and assets | ASSETS AT AMORTIZED COST |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial assets, at fair value | 19,843 | 27,164 |  |  | 9,231 |
Other receivables and assets | Recurring fair value measurement |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial assets | 19,843 | 27,164 |  |  | 9,231 |
Cash and cash equivalents |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial assets, at fair value | 144,221 | 251,942 |  |  | 26,950 |
Cash and cash equivalents | ASSETS AT FAIR VALUE THROUGH PROFIT AND LOSS |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial assets, at fair value | 0 | 0 |  |  | 0 |
Cash and cash equivalents | ASSETS AT AMORTIZED COST |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial assets, at fair value | 144,221 | 251,942 |  |  | 26,950 |
Cash and cash equivalents | Recurring fair value measurement |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Financial assets | 144,221 | 251,942 |  |  | 26,950 |
Long-term advances made to CROs | Recurring fair value measurement | Credit spread | Discounted cash flow |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Decrease in financial assets at fair value | € 235 | € 23 |  |  | € 240 |
Long-term advances made to CROs | Recurring fair value measurement | Bottom of range | Credit spread | Discounted cash flow |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Significant unobservable input, assets | 0.0131 | 0.0104 |  |  | 0.0016 |
Long-term advances made to CROs | Recurring fair value measurement | Top of range | Credit spread | Discounted cash flow |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Significant unobservable input, assets | 0.0271 | 0.0218 |  |  | 0.0476 |
[1] | 1 In application of the Amendments to IAS 1 Presentation of Financial Statements – Classification of Liabilities as Current or Non-current, and Non-current Liabilities with Covenants, the non-current portion of the OCEANE bonds as of December 31, 2022, amounting to €19,332 thousand, and the non-current portion of the Heights convertible notes as of December 31, 2023, amounting to €20,652 thousand, were reclassified within the current liabilities (Convertible loan notes) as of December 31, 2022 and 2023 respectively (see Note 2).

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