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Financial liabilities - Disclosure of conditional advances (Details) - EUR (€) € in Thousands | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of detailed information about borrowings [line items] |  |  |  |
Conditional advances | € 0 |  | € 6,771 | € 6,783
RNP VIR – Bpifrance |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Conditional advances | 0 | € 2,945 | 4,232 | 4,171
CARENA – Bpifrance |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Conditional advances | 0 | € 3,255 | 2,485 | 2,454
EBOLA – Bpifrance |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Conditional advances | € 0 |  | € 55 | € 158

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- Definition Conditional Advances + References No definition available. + Details
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Namespace Prefix: | abvx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=abvx_RNPVIRConditionalAdvanceBPIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=abvx_CARENAConditionalAdvanceBPIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=abvx_EbolaConditionalAdvanceBPIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |