The interest rate on borrowings. [Refer: Borrowings]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 7
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_7&doctype=Standard
-URIDate 2025-03-27

+ Details

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

- Definition

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

+ 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_NotionalAmount
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow from borrowings obtained. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2025-01-01
-Paragraph 17
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_17_c&doctype=Standard
-URIDate 2025-03-27

+ Details

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

- Definition

Maturity term of the warrants issued by the entity.

+ References

No definition available.

+ Details

Name:	iva_ClassOfWarrantOrRightMaturityTerm
Namespace Prefix:	iva_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	iva_IfrsClassOfWarrantOrRightExercisePriceOfWarrantsOrRights
Namespace Prefix:	iva_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

+ Details

Name:	iva_IfrsClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
Namespace Prefix:	iva_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Disclosure of information about collaborative arrangement and arrangement other than collaborative applicable to revenue-generating activity or operations.

+ References

No definition available.

+ Details

Name:	iva_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeLineItems
Namespace Prefix:	iva_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	iva_IfrsDebtInstrumentTerm
Namespace Prefix:	iva_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum gross proceeds from receivable upon exercise of warrants.

+ References

No definition available.

+ Details

Name:	iva_MaximumGrossProceedsReceivableUponExerciseOfWarrants
Namespace Prefix:	iva_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number of warrants issued

+ References

No definition available.

+ Details

Name:	iva_NumberOfWarrantsIssued
Namespace Prefix:	iva_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Treatment period under study

+ References

No definition available.

+ Details

Name:	iva_TreatmentPeriodUnderStudy
Namespace Prefix:	iva_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Term of warrants.

+ References

No definition available.

+ Details

Name:	iva_WarrantsTerm
Namespace Prefix:	iva_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Details

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

- Details

Name:	ifrs-full_CategoriesOfFinancialLiabilitiesAxis=ifrs-full_FinancialLiabilitiesAtAmortisedCostMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	ifrs-full_BorrowingsByNameAxis=iva_RoyaltyCertificates2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=iva_RoyaltyCertificates2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	iva_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeAxis=iva_WarrantAgreementWithEuropeanInvestmentBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	iva_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeAxis=iva_LegendPhaseIiaCombinationTrialWithLanifibranorAndEmpagliflozinInPatientsWithMashNashAndT2dMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Company information - Significant events of 2025 (Details) - EUR (€)									1 Months Ended	12 Months Ended
	Jul. 18, 2024	Mar. 18, 2024	Jan. 10, 2024	Jan. 04, 2024	Aug. 31, 2023	Dec. 08, 2022	Nov. 28, 2022	Jul. 01, 2022	Nov. 30, 2022	Dec. 31, 2024	Dec. 31, 2025	Jan. 18, 2024	Dec. 31, 2023	Dec. 29, 2023	Dec. 31, 2022	May 16, 2022
Collaborative Arrangements
Subscription of borrowings										€ 24,916,000
Finance contract with EIB
Collaborative Arrangements
Number of warrants issued									2,266,023
Notional amount																€ 50,000,000
Finance contract with EIB, first tranche (Tranche A)
Collaborative Arrangements
Number of warrants issued							2,266,023
Notional amount															€ 25,000,000
Number of shares per instrument							1			2.7	6.46		1.2
Interest rate						8.00%
Maturity term after the disbursement of the tranche						4 years
Finance contract with EIB, first tranche (Tranche A) \| Financial liabilities at amortized cost
Collaborative Arrangements
Notional amount						€ 25,000,000
Finance contract with EIB, second tranche (Tranche B)
Collaborative Arrangements
Number of warrants issued				3,144,654
Exercise price of warrant				€ 3.95
Maturity term of warrants				12 years
Term of warrants				12 years
Maximum gross proceeds				€ 12,421,383
Notional amount														€ 25,000,000
Subscription of borrowings			€ 25,000,000
Number of shares per instrument				1						2.13	5.05
Interest rate			7.00%
Maturity term after the disbursement of the tranche			3 years
Finance contract with EIB, second tranche (Tranche B) \| Financial liabilities at amortized cost
Collaborative Arrangements
Notional amount												€ 25,000,000
2024 Royalty Certificates
Collaborative Arrangements
Notional amount	€ 20,100,000
Subscription of borrowings	€ 20,100,000
2023 Royalty Certificates
Collaborative Arrangements
Subscription of borrowings					€ 5,100,000
Warrant agreement with the European Investment Bank
Collaborative Arrangements
Maturity term of warrants								12 years
LEGEND Phase IIa combination trial with lanifibranor and empagliflozin in patients with MASH/NASH and T2D
Collaborative Arrangements
Treatment period under study		168 days