Borrowings, Fixed Conversion Price

No definition available.

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

- Definition

Equity Issuance, Subscription Price Per Share

+ References

No definition available.

+ Details

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

- Definition

Increase (Decrease) In Number Of Ordinary Shares Issued Through Capital Increase

+ References

No definition available.

+ Details

Name:	abvx_IncreaseDecreaseInNumberOfOrdinarySharesIssuedThroughCapitalIncrease
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

Issue Of Equity, Offering Price Per Share

+ References

No definition available.

+ Details

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

- Definition

Number Of Convertible Notes Converted

+ References

No definition available.

+ Details

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

- Definition

Number Of Free Shares Issued

+ References

No definition available.

+ Details

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

- Definition

Number Of Warrants Exercised

+ References

No definition available.

+ Details

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

- Definition

Other Share Warrants, Subscription Price Per Share

+ References

No definition available.

+ Details

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

- Definition

Share Issue Related Cost (Credit)

+ References

No definition available.

+ Details

Name:	abvx_ShareIssueRelatedCostCredit
Namespace Prefix:	abvx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Share Warrants, Subscription Price Per Share

+ References

No definition available.

+ Details

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

- Definition

The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

+ 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 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard
-URIDate 2025-03-27

+ Details

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

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

- Definition

The increase (decrease) in the number of ordinary shares issued. [Refer: Ordinary shares [member]]

+ References

+ Details

Name:	ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ 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_IncreaseDecreaseThroughExerciseOfWarrantsEquity
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The increase in equity through the issue of equity instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 106
-Subparagraph d
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_106_d_iii&doctype=Standard
-URIDate 2025-03-27

+ Details

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

- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

+ Details

Name:	ifrs-full_NotionalAmount
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2025-01-01
-Paragraph 45
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_45&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2025-01-01
-Paragraph 47
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

The nominal value per share.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph B10
-Subparagraph a
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_B10_a_iii&doctype=Appendix&subtype=B
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 160
-Subparagraph a
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_160_a_iii&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 79
-Subparagraph a
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_79_a_iii&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_ParValuePerShare
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:perShareItemType
Balance Type:	na
Period Type:	instant

- References

+ Details

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

- Details

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

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=abvx_BSA20241AndBSA20242Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	abvx_FinancialAgreementAxis=abvx_Kreos1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=abvx_KreosABSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=abvx_KreosBBSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

Shareholders’ equity - Change in share capital (Details) € / shares in Units, € in Thousands										1 Months Ended		12 Months Ended
	Nov. 25, 2025 € / shares shares	Aug. 28, 2025 EUR (€) shares	Aug. 08, 2025 € / shares shares	Jul. 30, 2025 EUR (€) note € / shares shares	Jul. 30, 2025 EUR (€) note € / shares shares	Jul. 28, 2025 € / shares shares	Oct. 24, 2023 € / shares shares	May 24, 2023 EUR (€) € / shares shares	Feb. 22, 2023 EUR (€) € / shares shares	Mar. 31, 2024 shares	Oct. 31, 2020 shares	Dec. 31, 2025 EUR (€) € / shares shares	Dec. 31, 2024 EUR (€) € / shares shares	Dec. 31, 2023 EUR (€) € / shares shares	Jul. 28, 2025 $ / shares	Jul. 23, 2025 note	Nov. 19, 2024 € / shares	Oct. 24, 2023 $ / shares	Aug. 22, 2023 € / shares	Aug. 20, 2023 € / shares
Disclosure of classes of share capital [line items]
Capital increase from issuance of ordinary shares \| €									€ 130,000			€ 637,462		€ 353,377
Capital increase from issuance of ordinary shares (in shares)							20,325,500		20,000,000			11,679,400		40,325,500
Par value per share (in euro per share) \| € / shares							€ 0.01	€ 0.01	€ 0.01			€ 0.01	€ 0.01	€ 0.01			€ 0.01
Equity issuance, subscripion price per share (in euro per share) \| € / shares									€ 6.50
Exercises of the Kreos/Claret and other share warrants \| €		€ 11,531			€ 15,143								€ 45
Exercises of share warrants (in shares)											464,309		4,000
Share issue related cost \| €														€ 28,111
Transaction costs related to capital increase \| €												€ (40,306)	€ 446	(28,111)
Issue of free shares (in shares)												627,714	415,019
Closing foreign exchange rate																1.1726
Heights convertible notes
Disclosure of classes of share capital [line items]
Equity issuance, subscripion price per share (in euro per share) \| € / shares																				€ 14.4303
Number of convertible notes converted \| note				200	200											150
Notional amount \| €				€ 21,900	€ 21,900
Increase (decrease) in number of ordinary shares issued (in shares)				920,377
Borrowings, fixed conversion price (in euro per share) \| € / shares				€ 23.7674	€ 23.7674
Kreos & Claret convertible notes (OCABSA)
Disclosure of classes of share capital [line items]
Borrowings, fixed conversion price (in euro per share) \| € / shares																			€ 21.2209
ADS
Disclosure of classes of share capital [line items]
Capital increase from issuance of ordinary shares (in shares)						11,679,400	18,699,460
Issue of equity, offering price per share (in dollar/euro per share) \| $ / shares															$ 64.00			$ 11.60
Increase (decrease) in number of ordinary shares issued (in shares)						11,679,400
Ordinary shares
Disclosure of classes of share capital [line items]
Capital increase from issuance of ordinary shares (in shares)							1,626,040
Issue of equity, offering price per share (in dollar/euro per share) \| € / shares						€ 54.58	€ 10.9864
Ordinary shares \| Kreos & Claret convertible notes (OCABSA)
Disclosure of classes of share capital [line items]
Increase (decrease) in number of ordinary shares issued (in shares)	392,695		785,389
Borrowings, fixed conversion price (in euro per share) \| € / shares	€ 21.2209		€ 21.2209
Ordinary shares \| Kreos A & B & C BSA
Disclosure of classes of share capital [line items]
Increase (decrease) in number of ordinary shares issued (in shares)		206,662			319,251
BSA-2024-1 and BSA-2024-2
Disclosure of classes of share capital [line items]
Number of instruments issued (in shares)										77,820
Share warrants, subscription price (in euro per share) \| € / shares													€ 2.57
Kreos A & B BSA
Disclosure of classes of share capital [line items]
Exercises of the Kreos/Claret and other share warrants \| €								€ 1,850						€ 1,850
Exercises of share warrants (in shares)								99,583						99,583
Other share warrants, subscripion price per share (in euro per share) \| € / shares								€ 18.57
Kreos A & B BSA \| Kreos A BSA
Disclosure of classes of share capital [line items]
Number of warrants exercised (in shares)								67,887
Kreos A & B BSA \| Kreos B BSA
Disclosure of classes of share capital [line items]
Number of warrants exercised (in shares)								31,696
Other equity agreement
Disclosure of classes of share capital [line items]
Number of warrants exercised (in shares)												257,087	4,000	1,906
Exercises of the Kreos/Claret and other share warrants \| €												€ 3,346		€ 2
Exercises of share warrants (in shares)												257,087	4,000	190,550
Other share warrants, subscripion price per share (in euro per share) \| € / shares												€ 13.02	€ 11.14	€ 0.01