The amount of capital commitments for which the entity has entered into a contract. [Refer: Capital commitments]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_ContractualCapitalCommitments
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

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

- Definition

Amount of commitment contractual bonus or malus capped amount.

+ References

No definition available.

+ Details

Name:	iva_CommitmentContractualBonusOrMalusCappedAmount
Namespace Prefix:	iva_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Commitments, amount payable by other party within same agreement.

+ References

No definition available.

+ Details

Name:	iva_CommitmentsAmountPayableByOtherPartyWithinSameAgreement
Namespace Prefix:	iva_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Commitment amount payable for services received under contract.

+ References

No definition available.

+ Details

Name:	iva_CommitmentsAmountPayableForServicesReceivedUnderContract
Namespace Prefix:	iva_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of contractual capital commitment received.

+ References

No definition available.

+ Details

Name:	iva_ContractualCapitalCommitmentReceived
Namespace Prefix:	iva_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	iva_CommitmentsGivenAndReceivedAxis=iva_ContractResearchOrganizationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	iva_CommitmentsGivenAndReceivedAxis=iva_ContractManufacturingOrganizationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	iva_CommitmentsGivenAndReceivedAxis=iva_LeaseCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	iva_CommitmentsGivenAndReceivedAxis=iva_OtherCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	iva_CommitmentsGivenAndReceivedAxis=iva_AgreementsForProvisionOfFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	iva_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeAxis=iva_IfrsPurchaseCommitmentMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	iva_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeAxis=iva_ContractCroWithResearchAssociatesGroupeB.vMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CounterpartiesAxis=iva_SupplierFisherClinicalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CounterpartiesAxis=iva_SupplierMarkenSasMember
Namespace Prefix:
Data Type:	na
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Other financial information- Commitments given and received (Details) - EUR (€) € in Thousands	1 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2026	Jun. 30, 2025	Dec. 31, 2024	Apr. 30, 2021
Disclosure of associates [line items]
Total commitments given			€ 220,180	€ 187,248
Total commitments received			354	326
CRO
Disclosure of associates [line items]
Total commitments given			181,617	156,870
CMO
Disclosure of associates [line items]
Total commitments given			5,810	5,332
Lease
Disclosure of associates [line items]
Total commitments given			5,622	6,570
Others
Disclosure of associates [line items]
Total commitments given			27,132	18,476
Agreements concerning the provision of facilities
Disclosure of associates [line items]
Total commitments received			354	326
Purchase Commitment
Disclosure of associates [line items]
Total commitments given			26,900	18,500
Contract CRO with Pharmaceutical Research Associates B.V.
Disclosure of associates [line items]
Total commitments given	€ 276,200		181,600
Amount committed to pay					€ 13,300
Bonus or malus capped amount	3,400
Commitments, amount payable by other party within same agreement	€ 22,500
Contract CRO with Pharmaceutical Research Associates B.V. \| Forecast
Disclosure of associates [line items]
Bonus or malus capped amount		€ 700
Supplier Fisher Clinical \| Purchase Commitment
Disclosure of associates [line items]
Total commitments given			8,300	9,800
Supplier Marken SAS \| Purchase Commitment
Disclosure of associates [line items]
Total commitments given			€ 5,300	€ 0