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Financial liabilities - Disclosure of variation in lease liabilities (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of financial liabilities [abstract] |  |  |
Lease liabilities at beginning of period | € 540 | € 1,384 | € 214
Increase | 2,221 | 350 | 1,476
Decrease | (398) | (1,194) | (305)
Lease liabilities at end of period | € 2,363 | € 540 | € 1,384

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- Definition Decrease In Lease Liabilities + References No definition available. + Details
Name: | abvx_DecreaseInLeaseLiabilities
Namespace Prefix: | abvx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Increase In Lease Liabilities + References No definition available. + Details
Name: | abvx_IncreaseInLeaseLiabilities
Namespace Prefix: | abvx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | ifrs-full_DisclosureOfFinancialLiabilitiesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_47_b&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_LeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant