Aggregate Fair Value, Other Equity Instruments Outstanding

No definition available.

Name:	abvx_AggregateFairValueOtherEquityInstrumentsOutstanding
Namespace Prefix:	abvx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount Of Reasonably Possible Increase In Unobservable Input, Liabilities

+ References

No definition available.

+ Details

Name:	abvx_AmountOfReasonablyPossibleIncreaseInUnobservableInputLiabilities
Namespace Prefix:	abvx_
Data Type:	dtr-types1:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Borrowings, Maximum Borrowing Capacity Per Tranche

+ References

No definition available.

+ Details

Name:	abvx_BorrowingsMaximumBorrowingCapacityPerTranche
Namespace Prefix:	abvx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Borrowings, Number Of Tranches

+ References

No definition available.

+ Details

Name:	abvx_BorrowingsNumberOfTranches
Namespace Prefix:	abvx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Expiry Scenario Period, Other Equity Instruments Granted

+ References

No definition available.

+ Details

Name:	abvx_ExpiryScenarioPeriodOtherEquityInstrumentsGranted
Namespace Prefix:	abvx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Increase (Decrease) In Number Of Shares Issued Through Conversion Of Convertible Instruments

+ References

No definition available.

+ Details

Name:	abvx_IncreaseDecreaseInNumberOfSharesIssuedThroughConversionOfConvertibleInstruments
Namespace Prefix:	abvx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Increase (Decrease) In Number Of Shares Issued Through Exercise Of Share Warrants

+ References

No definition available.

+ Details

Name:	abvx_IncreaseDecreaseInNumberOfSharesIssuedThroughExerciseOfShareWarrants
Namespace Prefix:	abvx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Probability-Weighted Scenarios

+ References

No definition available.

+ Details

Name:	abvx_NumberOfProbabilityWeightedScenarios
Namespace Prefix:	abvx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Warrants Granted

+ References

No definition available.

+ Details

Name:	abvx_NumberOfWarrantsGranted
Namespace Prefix:	abvx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Warrants Repurchased

+ References

No definition available.

+ Details

Name:	abvx_NumberOfWarrantsRepurchased
Namespace Prefix:	abvx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- 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_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of increase (decrease) in the fair value measurement of assets due to a reasonably possible increase in an unobservable input.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2025-01-01
-Paragraph 93
-Subparagraph h
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_h_ii&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleIncreaseInUnobservableInputAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The increase (decrease) in equity resulting from the conversion of convertible instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 106
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_106_d&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_IncreaseDecreaseThroughConversionOfConvertibleInstruments
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The increase (decrease) in equity resulting from the exercise of warrants.

+ References

+ Details

Name:	ifrs-full_IncreaseDecreaseThroughExerciseOfWarrantsEquity
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The percentage of a reasonably possible increase in an unobservable input used in fair value measurement of liabilities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 13
-IssueDate 2025-01-01
-Paragraph 93
-Subparagraph h
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_h_ii&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_PercentageOfReasonablyPossibleIncreaseInUnobservableInputLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The value of significant unobservable input used in the measurement of the fair value of liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2025-01-01
-Paragraph 93
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_d&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_SignificantUnobservableInputLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	ifrs-full_UnobservableInputsAxis=ifrs-full_HistoricalVolatilityForSharesMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialLiabilitiesAxis=abvx_KreosClaretMinimumReturnIndemnificationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialLiabilitiesAxis=abvx_KreosABCBSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_UnobservableInputsAxis=abvx_SharePriceMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_UnobservableInputsAxis=abvx_RiskFreeInterestRateMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_UnobservableInputsAxis=abvx_FinalRedemptionScenarioProbabilityMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_UnobservableInputsAxis=ifrs-full_DiscountRateMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_UnobservableInputsAxis=abvx_ExpiryScenarioProbablityMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abvx_TranchesAxis=abvx_KreosClaretFinancingTrancheABMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfLiabilitiesAxis=abvx_KreosClaretMinimumReturnIndemnificationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_UnobservableInputsAxis=abvx_MinimalReturnMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ValuationTechniquesUsedInFairValueMeasurementAxis=abvx_AmortizedCostEIRMethodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abvx_TranchesAxis=abvx_KreosClaretFinancingTrancheCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abvx_TranchesAxis=abvx_KreosClaretFinancingTrancheABAndCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abvx_FinancialAgreementAxis=abvx_KreosClaretFinancingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abvx_WarrantsAxis=abvx_KreosABBSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abvx_WarrantsAxis=abvx_KreosCBSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abvx_WarrantsAxis=abvx_KreosABAndCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abvx_WarrantsAxis=abvx_KreosABCBSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=abvx_KreosClaretFinancingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=abvx_KreosClaretFinancingTrancheAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_OrdinarySharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=ifrs-full_MajorOrdinaryShareTransactionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=abvx_KreosABCBSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Financial liabilities - Kreos / Claret Financing (Details) € / shares in Units, € in Thousands						9 Months Ended		12 Months Ended
	Nov. 25, 2025 shares	Aug. 28, 2025 EUR (€) shares	Aug. 06, 2025 EUR (€) shares	Nov. 02, 2023 shares	Aug. 20, 2023 EUR (€) tranche shares	Sep. 30, 2025 EUR (€) scenario shares	Sep. 30, 2024 EUR (€) shares	Dec. 31, 2024 EUR (€) € / shares	Jul. 31, 2025 EUR (€)
Disclosure of detailed information about borrowings [line items]
Exercises of share warrants (in shares) \| shares							4,000
Exercise of Kreos/Claret and other share warrants							€ 45
Volatility
Disclosure of detailed information about borrowings [line items]
Percentage of reasonably possible increase in unobservable input, liabilities								1.00%
Volatility \| Kreos/Claret Minimal Return Indemnifications
Disclosure of detailed information about borrowings [line items]
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets								€ (1)
Volatility \| Kreos A & B & C BSA
Disclosure of detailed information about borrowings [line items]
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets								€ 37
Ordinary share price (in euro per share)
Disclosure of detailed information about borrowings [line items]
Amount of reasonably possible increase in unobservable input, liabilities \| € / shares								€ 1
Ordinary share price (in euro per share) \| Kreos/Claret Minimal Return Indemnifications
Disclosure of detailed information about borrowings [line items]
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets								€ (3)
Ordinary share price (in euro per share) \| Kreos A & B & C BSA
Disclosure of detailed information about borrowings [line items]
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets								€ 350
Risk-free rate
Disclosure of detailed information about borrowings [line items]
Percentage of reasonably possible increase in unobservable input, liabilities								1.00%
Risk-free rate \| Kreos/Claret Minimal Return Indemnifications
Disclosure of detailed information about borrowings [line items]
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets								€ (3)
Risk-free rate \| Kreos A & B & C BSA
Disclosure of detailed information about borrowings [line items]
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets								€ 61
Minimal return
Disclosure of detailed information about borrowings [line items]
Percentage of reasonably possible increase in unobservable input, liabilities								10.00%
Minimal return \| Kreos/Claret Minimal Return Indemnifications
Disclosure of detailed information about borrowings [line items]
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets								€ 3
Discount rate
Disclosure of detailed information about borrowings [line items]
Percentage of reasonably possible increase in unobservable input, liabilities								1.00%
Discount rate \| Kreos/Claret Minimal Return Indemnifications
Disclosure of detailed information about borrowings [line items]
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets								€ (82)
7-year expiry scenario probability
Disclosure of detailed information about borrowings [line items]
Percentage of reasonably possible increase in unobservable input, liabilities								10.00%
7-year expiry scenario probability \| Kreos A & B & C BSA
Disclosure of detailed information about borrowings [line items]
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets								€ 75
Kreos & Claret Financing, Tranche A-B \| Kreos/Claret Minimal Return Indemnifications \| Minimal return \| Amortized cost (EIR method)
Disclosure of detailed information about borrowings [line items]
Significant unobservable input, liabilities								1.4
Kreos & Claret financing, tranche C \| Kreos/Claret Minimal Return Indemnifications \| Minimal return \| Amortized cost (EIR method)
Disclosure of detailed information about borrowings [line items]
Significant unobservable input, liabilities								1.3
Kreos & Claret Financing, Tranche A,B and C \| Kreos/Claret Minimal Return Indemnifications
Disclosure of detailed information about borrowings [line items]
Fair value of other equity instruments									€ 3,620
Kreos & Claret financing
Disclosure of detailed information about borrowings [line items]
Exercises of share warrants (in shares) \| shares						525,913
Exercise of Kreos/Claret and other share warrants						€ 33,768
Kreos A & B BSA
Disclosure of detailed information about borrowings [line items]
Fair value of other equity instruments								€ 243
Kreos C BSA
Disclosure of detailed information about borrowings [line items]
Fair value of other equity instruments								€ 923
Kreos A-B and C
Disclosure of detailed information about borrowings [line items]
Expiry scenario period, other equity instruments granted								7 years
Kreos A & B & C BSA
Disclosure of detailed information about borrowings [line items]
Number of probability-weighted scenarios \| scenario						2
Expiry scenario period, other equity instruments granted						7 years
Kreos & Claret financing
Disclosure of detailed information about borrowings [line items]
Borrowings, number of tranches \| tranche					3
Borrowings, maximum borrowing capacity per tranche					€ 25,000
Kreos & Claret financing \| Kreos A & B BSA
Disclosure of detailed information about borrowings [line items]
Number of warrants granted (in shares) \| shares					214,198
Kreos & Claret financing \| Kreos C BSA
Disclosure of detailed information about borrowings [line items]
Number of warrants granted (in shares) \| shares				405,832
Kreos & Claret convertible notes (OCABSA) \| Ordinary shares
Disclosure of detailed information about borrowings [line items]
Conversion of convertible instruments (in shares) \| shares			785,389
Conversion of Kreos OCABSA and heights notes			€ 16,058
Kreos & Claret convertible notes (OCABSA) \| Ordinary shares \| Major ordinary share transactions
Disclosure of detailed information about borrowings [line items]
Conversion of convertible instruments (in shares) \| shares	392,695
Kreos A & B & C BSA \| Kreos & Claret financing
Disclosure of detailed information about borrowings [line items]
Number of warrants repurchased (in shares) \| shares			94,117
Kreos A & B & C BSA \| Ordinary shares \| Kreos & Claret financing
Disclosure of detailed information about borrowings [line items]
Exercises of share warrants (in shares) \| shares		206,662	319,251
Exercise of Kreos/Claret and other share warrants		€ 11,531	€ 15,143