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v3.26.1

Segment information (Details) | 12 Months Ended
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Dec. 31, 2025 segment
Disclosure of geographical areas [line items] |
Number of operating segments | 1
United States |
Disclosure of geographical areas [line items] |
Contribution to Group's assets, percentage | 29.00%
United States | Top of range |
Disclosure of geographical areas [line items] |
Contribution to Group's liabilities, percentage | 10.00%
Contribution to Group's net profits (losses), percentage | 10.00%

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- Definition Contribution To Group's Assets, Percentage + References No definition available. + Details
Name: | abvx_ContributionToGroupsAssetsPercentage
Namespace Prefix: | abvx_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Contribution To Group's Liabilities, Percentage + References No definition available. + Details
Name: | abvx_ContributionToGroupsLiabilitiesPercentage
Namespace Prefix: | abvx_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Contribution To Group's Net Profits (Losses), Percentage + References No definition available. + Details
Name: | abvx_ContributionToGroupsNetProfitsLossesPercentage
Namespace Prefix: | abvx_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Operating Segment + References No definition available. + Details
Name: | abvx_NumberOfOperatingSegment
Namespace Prefix: | abvx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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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
Name: | ifrs-full_DisclosureOfGeographicalAreasLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_GeographicalAreasAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |