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Financial liabilities - Lease liabilities (Details) - EUR (€) € in Thousands |  | 1 Months Ended | 12 Months Ended
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May 02, 2024 | Apr. 30, 2024 | Nov. 30, 2023 | Sep. 30, 2023 | Dec. 31, 2022 | Jul. 31, 2022 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure Of Lease Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Expense on lease liabilities |  |  |  |  |  |  | € 808 | € 730 | € 548
Depreciation expense, lease |  |  |  |  |  |  | 744 | 788 | 498
Interest expense on lease liabilities |  |  |  |  |  |  | 64 | 61 | 13
Expense relating to short-term leases |  |  |  |  |  |  | € 349 | € 352 | € 334
Lease facilities, Paris |  |  |  |  |  |  |  |  |
Disclosure Of Lease Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Lease, duration period | 3 years |  |  |  |  | 3 years |  |  |
Lease, tacit renewal period |  |  |  |  |  | 2 years |  |  |
Lease, break clause period |  |  |  |  |  | 1 year |  |  |
Decrease in lease liabilities through modification of term |  |  |  | € 622 |  |  |  |  |
Lease facilities, Boston |  |  |  |  |  |  |  |  |
Disclosure Of Lease Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Lease, duration period |  |  | 2 years |  |  |  |  |  |
Lease facilities, Boston | Minimum |  |  |  |  |  |  |  |  |
Disclosure Of Lease Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Lease, extension period |  |  | 1 year |  |  |  |  |  |
Lease facilities, Boston | Maximum |  |  |  |  |  |  |  |  |
Disclosure Of Lease Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Lease, extension period |  |  | 2 years |  |  |  |  |  |
Lease facilities, Montpellier |  |  |  |  |  |  |  |  |
Disclosure Of Lease Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Lease, duration period |  | 6 years |  |  | 1 year |  |  |  |
Lease, tacit renewal period |  | 6 years |  |  |  |  |  |  |
Lease, break clause period |  | 6 months |  |  |  |  |  |  |
Lease facilities |  |  |  |  |  |  |  |  |
Disclosure Of Lease Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Lease liability, percentage of total |  |  |  |  |  |  | 70.00% | 93.00% | 93.00%

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- Definition Decrease In Lease Liabilities Through Modification Of Term + References No definition available. + Details
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- Definition Depreciation Expense, Lease + References No definition available. + Details
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- Definition Expense Relating To Short-Term Leases And Low Value Assets For Which Recognition Exemption Has Been Used + References No definition available. + Details
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