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

Name:	ifrs-full_DisclosureOfFinancialInstrumentsLineItems
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

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

- Details

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

- Details

Name:	dei_LegalEntityAxis=iva_CttqMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_SignificantInvestmentsInAssociatesAxis=iva_PharmaceuticalResearchAssociatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

Commitments related to operational activities (Details) - EUR (€) € in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2026	Dec. 31, 2024	Dec. 31, 2023	Jan. 14, 2022
Disclosure of detailed information about financial instruments [line items]
Commitment amount			€ 187,248	€ 221,135
Contract CRO with Pharmaceutical Research Associates B.V.
Disclosure of detailed information about financial instruments [line items]
Amount committed to pay					€ 13,300
Bonus or malus capped amount	€ 3,400
Commitment amount	232,500		156,870	€ 183,366
Contract CRO with Pharmaceutical Research Associates B.V. \| CTTQ
Disclosure of detailed information about financial instruments [line items]
Amount committed to pay	€ 20,200
Contract CRO with Pharmaceutical Research Associates B.V. \| Pharmaceutical Research Associates
Disclosure of detailed information about financial instruments [line items]
Commitment amount			€ 141,500
Forecast \| Contract CRO with Pharmaceutical Research Associates B.V.
Disclosure of detailed information about financial instruments [line items]
Bonus or malus capped amount		€ 700