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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Lease Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Expense on lease liabilities |  |  |  |  |  |  | € 730 | € 548 | € 424
Depreciation expense, lease |  |  |  |  |  |  | 788 | 498 | 414
Interest expense on lease liabilities |  |  |  |  |  |  | 61 | 13 | 10
Expense relating to short-term leases |  |  |  |  |  |  | € 352 | € 334 | € 331
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 |  |  |  |  | 97.00% |  | 93.00% | 93.00% | 97.00%

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- Definition Decrease In Lease Liabilities Through Modification Of Term + References No definition available. + Details
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Namespace Prefix: | abvx_
Data Type: | xbrli:monetaryItemType
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- Definition Depreciation Expense, Lease + References No definition available. + Details
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- Definition Disclosure Of Lease Liabilities [Line Items] + References No definition available. + Details
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- Definition Expense On Lease Liabilities + References No definition available. + Details
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Balance Type: | debit
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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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- Definition Lease, Break Clause Period + References No definition available. + Details
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- Definition Lease, Duration Period + References No definition available. + Details
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- Definition Lease, Extension Period + References No definition available. + Details
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- Definition Lease Liability, Percentage Of Total + References No definition available. + Details
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- Definition Lease, Tacit Renewal Period + References No definition available. + Details
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- Definition The amount of interest expense on lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 53 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Details
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- Details
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- Details
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