The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2022-03-24
-Paragraph 114
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2022-en-r&anchor=para_114&doctype=Standard
-URIDate 2022-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2022-03-24
-Paragraph 113
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2022-en-r&anchor=para_113_a&doctype=Standard
-URIDate 2022-03-24

+ Details

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

- Definition

Represents the additional billing not included in contract.

+ References

No definition available.

+ Details

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

- Definition

Represents the cumulative amount of research funding received in a collaborative arrangement.

+ References

No definition available.

+ Details

Name:	iva_CollaborativeArrangementMilestonePaymentsReceived
Namespace Prefix:	iva_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

Maximum potential amount of regulatory and commercial milestone payments receivable, pursuant to licensing and collaborative arrangements.

+ References

No definition available.

+ Details

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

- Definition

Number of development and regulatory milestones to be achieved under the licensing and collaborative arrangements.

+ References

No definition available.

+ Details

Name:	iva_LicenseAndCollaborationAgreementNumberOfDevelopmentAndRegulatoryMilestones
Namespace Prefix:	iva_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of successive targets to be achieved under the licensing and collaborative arrangements.

+ References

No definition available.

+ Details

Name:	iva_LicenseAndCollaborationAgreementNumberOfSuccessiveTargets
Namespace Prefix:	iva_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of upfront fee receivable by the entity, pursuant to licensing and collaborative arrangements.

+ References

No definition available.

+ Details

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

- Definition

Maximum additional amount receivable by the entity, upon the achievement of certain commercial milestones, pursuant to licensing and collaborative arrangements.

+ References

No definition available.

+ Details

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

- Definition

Maximum additional amount receivable by the entity, upon the achievement of certain development and regulatory milestones, pursuant to licensing and collaborative arrangements.

+ References

No definition available.

+ Details

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

- Details

Name:	ifrs-full_ProductsAndServicesAxis=iva_RevenueFromResearchPartnershipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	iva_TypesOfRevenuesAxis=iva_UpfrontPaymentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	iva_TypesOfRevenuesAxis=iva_RegulatoryAndCommercialMilestonesPaymentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	iva_TypesOfRevenuesAxis=iva_RoyaltiesOnCommercialSalesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Revenues and Other Income - Additional information (Details) € in Thousands			12 Months Ended
	Sep. 28, 2022 EUR (€)	Sep. 22, 2022 USD ($) Milestone item	Dec. 31, 2022 USD ($)	Dec. 31, 2022 EUR (€)	Dec. 31, 2021 EUR (€)	Dec. 31, 2020 EUR (€)	Jan. 31, 2022 EUR (€)
Ifrs Collaborative Arrangement And Arrangement Other Than Collaborative Line items
Sales \| €				€ 12,179	€ 4,194	€ 372
Revenue From Research Partnerships [Member]
Ifrs Collaborative Arrangement And Arrangement Other Than Collaborative Line items
Sales \| €					4,200
AbbVie [Member]
Ifrs Collaborative Arrangement And Arrangement Other Than Collaborative Line items
Milestone payments received \| €					€ 4,000		€ 4,000
Licensing and collaboration agreement with CTTQ
Ifrs Collaborative Arrangement And Arrangement Other Than Collaborative Line items
Upfront payment receivable		$ 12,000,000.0
Number of development and regulatory milestones \| Milestone		6
Maximum additional amount receivable upon the achievement of certain development and regulatory milestones		$ 40,000,000	$ 40,000,000
Number of successive targets \| item		6
Maximum additional amount receivable upon the achievement of certain commercial milestones		$ 250,000,000	250,000,000
Maximum potential Regulatory and Commercial Milestone payments receivable		290,000,000
Sales \| €				12,100
Additional billing not included in contract \| €	€ 600
Licensing and collaboration agreement with CTTQ \| Upfront payment
Ifrs Collaborative Arrangement And Arrangement Other Than Collaborative Line items
Upfront payment receivable		$ 12,000,000.0
Sales \| €				€ 12,000
Licensing and collaboration agreement with CTTQ \| Regulatory and Commercial Milestones Payments
Ifrs Collaborative Arrangement And Arrangement Other Than Collaborative Line items
Sales			0
Licensing and collaboration agreement with CTTQ \| Royalties on commercial sales
Ifrs Collaborative Arrangement And Arrangement Other Than Collaborative Line items
Sales			$ 0