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Off-balance sheet commitments given (Details) € in Thousands, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 16, 2016 EUR (€) | Dec. 16, 2013 EUR (€) | Nov. 11, 2006 USD ($) academic_institution | Apr. 30, 2024 | Dec. 31, 2022 EUR (€) | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Jun. 02, 2017 EUR (€) | Apr. 15, 2009 | Dec. 04, 2008 license
Disclosure Of Off-Balance Sheet Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of conditional advances |  |  |  |  |  | € 2,708 | € 110 | € 90 |  |  |
Capital commitments |  |  |  |  | € 194,731 | 234,908 | € 201,777 | € 194,731 |  |  |
Lease facilities, Montpellier |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Off-Balance Sheet Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease, duration period |  |  |  | 6 years | 1 year |  |  |  |  |  |
CARENA conditional advance |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Off-Balance Sheet Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum drawdown capacity including interest |  | € 3,840 |  |  |  |  |  |  |  |  |
Annual percentage of proceeds from sale of intellectual property right |  | 50.00% |  |  |  |  |  |  |  |  |
Annual revenue from sale of products developed, period |  | 5 years |  |  |  |  |  |  |  |  |
Percentage of annual revenue from sale of products developed |  | 1.20% |  |  |  |  |  |  |  |  |
Repayments of conditional advances |  |  |  |  |  | € 234 |  |  |  |  |
Maximum drawdown capacity |  | € 3,840 |  |  |  |  |  |  |  |  |
RNP-VIR conditional advance |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Off-Balance Sheet Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum drawdown capacity including interest | € 6,576 |  |  |  |  |  |  |  |  |  |
Annual percentage of proceeds from sale of intellectual property right | 50.00% |  |  |  |  |  |  |  |  |  |
Annual revenue from sale of products developed, period | 5 years |  |  |  |  |  |  |  |  |  |
Percentage of annual revenue from sale of products developed | 3.00% |  |  |  |  |  |  |  |  |  |
Maximum drawdown capacity | € 6,300 |  |  |  |  |  |  |  |  |  |
Ebola conditional advance |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Off-Balance Sheet Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum drawdown capacity |  |  |  |  |  |  |  |  | € 390 |  |
Ebola conditional advance, BPI Languedoc-Roussillon |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Off-Balance Sheet Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum drawdown capacity |  |  |  |  |  |  |  |  | 130 |  |
Ebola conditional advance, BPI France |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Off-Balance Sheet Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum drawdown capacity |  |  |  |  |  |  |  |  | € 260 |  |
Minimum | CARENA conditional advance |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Off-Balance Sheet Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax revenue threshold |  | 50,000 |  |  |  |  |  |  |  |  |
Minimum | RNP-VIR conditional advance |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Off-Balance Sheet Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax revenue threshold | 25,000 |  |  |  |  |  |  |  |  |  |
Maximum | CARENA conditional advance |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Off-Balance Sheet Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Annual revenue from sale of products developed |  | € 6,800 |  |  |  |  |  |  |  |  |
Repayment period |  | 15 years |  |  |  |  |  |  |  |  |
Maximum | RNP-VIR conditional advance |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Off-Balance Sheet Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Annual revenue from sale of products developed | € 5,500 |  |  |  |  |  |  |  |  |  |
Repayment period | 15 years |  |  |  |  |  |  |  |  |  |
The Scripps Research Institute, University of Chicago and Brigham Young University |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Off-Balance Sheet Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  |  |  |  |  | 0.41% |  |  |  |  |
Exclusive licensing agreement with CNRS, University of Montpellier and Institut Curie |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Off-Balance Sheet Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of exclusive licenses | license |  |  |  |  |  |  |  |  |  |  | 4
Research and collaboration agreement with CNRS, University of Montpellier and Institut Curie |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Off-Balance Sheet Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Agreement, period |  |  |  |  |  |  |  |  |  | 1 year |
Exclusive licensing contract with the Scripps Research Institute, University of Chicago and Brigham Young University |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Off-Balance Sheet Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Potential development milestone payment, IND filing | $ |  |  | $ 50 |  |  |  |  |  |  |  |
Potential development milestone payment, phase 3 | $ |  |  | 300 |  |  |  |  |  |  |  |
Potential development milestone payment, IND approval | $ |  |  | $ 500 |  |  |  |  |  |  |  |
Number of academic institutions | academic_institution |  |  | 3 |  |  |  |  |  |  |  |

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