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
-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_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

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

The amount of bonus or malus amount included in contractual commitments.

+ References

No definition available.

+ Details

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

- Definition

Remaining amount payable under contract.

+ References

No definition available.

+ Details

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

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_GeographicalAreasAxis=country_CN
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	iva_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeAxis=iva_OtherAgreementsMember
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
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Commitments related to operational activities (Details) - EUR (€) € in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 12, 2023	Jan. 14, 2022
Disclosure of detailed information about financial instruments [line items]
Commitment amount	€ 133,633	€ 187,248	€ 221,136
Contract CRO with Pharmaceutical Research Associates B.V.
Disclosure of detailed information about financial instruments [line items]
Amount committed to pay					€ 13,300
Commitment amount	93,553	156,870	183,366	€ 277,600
Remaining amount payable under contract	88,400
Bonus or malus capped amount				€ 700
Contract CRO with Pharmaceutical Research Associates B.V. \| China
Disclosure of detailed information about financial instruments [line items]
Commitment amount	23,900
Others
Disclosure of detailed information about financial instruments [line items]
Commitment amount	31,576	18,476	€ 23,442
Supplier Fisher Clinical \| Others
Disclosure of detailed information about financial instruments [line items]
Commitment amount	6,900	9,800
Supplier Marken SAS \| Others
Disclosure of detailed information about financial instruments [line items]
Commitment amount	€ 5,100	€ 0