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Significant events for the years ended December 31, 2023, 2024 and 2025 and subsequent events - For the year ended 2024 (Details) € / shares in Units, € in Thousands, $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 8 Months Ended | 10 Months Ended | 12 Months Ended | 27 Months Ended | 31 Months Ended | 73 Months Ended | 109 Months Ended | 145 Months Ended |  |  |  |  |
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Nov. 19, 2024 USD ($) | Jul. 11, 2024 shares | Jun. 21, 2024 EUR (€) | Apr. 04, 2024 shares | Mar. 28, 2024 EUR (€) | Jun. 30, 2024 EUR (€) | Mar. 31, 2024 shares | Nov. 30, 2019 EUR (€) | Aug. 31, 2018 EUR (€) | Sep. 30, 2017 EUR (€) | Jun. 30, 2016 EUR (€) | Sep. 30, 2014 EUR (€) | Dec. 31, 2013 EUR (€) | Dec. 31, 2024 EUR (€) € / shares | Sep. 30, 2024 shares plan | Nov. 30, 2025 plan | Dec. 31, 2025 EUR (€) shares € / shares | Dec. 31, 2024 EUR (€) € / shares | Dec. 31, 2023 EUR (€) € / shares | Nov. 30, 2019 EUR (€) | Jun. 30, 2016 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2025 EUR (€) € / shares | Nov. 19, 2024 shares € / shares | Oct. 24, 2023 € / shares | Aug. 20, 2023 EUR (€) € / shares | May 24, 2023 € / shares | Feb. 22, 2023 € / shares
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of free shares plans issued | plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 | 8 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 175,000 |  |  |  |  |
Par value per share (in euro per share) | € / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | € 0.01 |  |  | € 0.01 | € 0.01 | € 0.01 |  |  |  |  | € 0.01 | € 0.01 | € 0.01 |  | € 0.01 | € 0.01
Income from government grants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 0 | € 4,140 | € 81 |  |  |  |  |  |  |  |  |  |
Number of ADS per ordinary shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
At-The-Market (ATM) Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected proceeds from share issuance | $ | $ 150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected proceeds from share issuance, shelf registration | $ | $ 350,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RNP-VIR conditional advance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from conditional advances |  |  |  |  |  |  |  | € 1,930 | € 346 | € 1,756 |  |  |  |  |  |  |  |  |  | € 4,032 |  | € 4,032 |  |  |  |  |  |  |
Proceeds from government grants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 1,123 |  |  |  |  |  |  |  |  |
Percentage of conditional advances waived |  |  |  |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from government grants |  |  |  |  |  | € 1,872 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CARENA conditional advance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from conditional advances |  |  |  |  |  | € 1,068 |  |  |  |  | € 29 | € 1,008 | € 1,150 |  |  |  |  |  |  |  | € 2,187 |  | € 2,187 |  |  |  |  |  |
Percentage of conditional advances waived |  |  |  |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from government grants |  |  |  |  |  | € 2,251 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RNP-VIR conditional advance and CARENA conditional advance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from government grants |  |  |  |  |  |  |  |  |  |  |  |  |  | € 4,123 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kreos & Claret financing, tranche B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings |  |  |  |  | € 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kreos & Claret financing, tranche C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings |  |  | € 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maximum borrowing capacity |  |  | € 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kreos & Claret financing, tranche B and C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 25,000 |  |
Par value per share (in euro per share) | € / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 1.00 |  |
AGA-2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,946,125 |  |  |  |  |  |  |  |  |  |  |  |  |  |
AGA-2024 | Tranche 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
AGA-2024 | Tranche 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
AGA-2024 | Tranche 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
AGA-2024-6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) | shares |  | 20,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
BSA-2024-1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) | shares |  |  |  | 58,365 |  |  | 77,820 |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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