The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2022-03-24
-Paragraph 47
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2022-03-24

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2022-03-24
-Paragraph 45
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

This amount represents the information of invoiced to counterparty.

+ References

No definition available.

+ Details

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

- Definition

This amount represents the information of invoiced to counterparty for additional payment.

+ References

No definition available.

+ Details

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

- Definition

This amount represents the information of invoiced to counterparty for initial payment.

+ References

No definition available.

+ Details

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

- Definition

Maximum amount of bonus or malus payable on amount committed by the company to pay for services received under contract.

+ References

No definition available.

+ Details

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

- Definition

Maximum amount of bonus or malus payable on amount committed by the company to pay for services received under contract.

+ References

No definition available.

+ Details

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

- Definition

This amount represents the information of exchange rate on ratio of invoice.

+ References

No definition available.

+ Details

Name:	iva_ExchangeRateOnInvoice
Namespace Prefix:	iva_
Data Type:	xbrli:pureItemType
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

Amount of short-term potential milestone payment receivable by the entity under the license and collaboration agreement.

+ References

No definition available.

+ Details

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

- Definition

Amount received by the entity from licensing and collaborative arrangements, attributable to withholding taxes.

+ References

No definition available.

+ Details

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

- Definition

The amount paid on licensing arrangements.

+ References

No definition available.

+ Details

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

- Details

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

- Details

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

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=iva_Bsa20231ShareWarrantPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=iva_NewBonusShareAwardPlan20231Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=iva_LongTermIncentivePlanInPerformanceUnits2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Company information - CTTQ (Details) € in Millions, $ in Millions								6 Months Ended
	Jul. 19, 2023 USD ($) $ / €	Jul. 19, 2023 EUR (€) $ / €	Jun. 26, 2023 EUR (€)	May 25, 2023 shares	May 25, 2023	May 22, 2023 USD ($)	May 22, 2023 EUR (€)	Jun. 30, 2023 USD ($)	Jun. 30, 2023 EUR (€)	Jun. 30, 2022	Jun. 30, 2023 EUR (€)
Licensing and collaboration agreement with CTTQ [Member]
Collaborative Arrangements
Amount Invoiced To Counterparty						$ 2.1	€ 1.9	$ 2.1
Amount Invoiced To Counterparty For Additional Payment						0.1	0.1
Amount received attributable to withholding taxes	$ 0.2	€ 0.2						0.1
Amount Invoiced To Counterparty For Initial Payment						$ 2.0	€ 1.8
Amount received on licensing arrangements	$ 1.9	€ 1.7
Short-term potential milestone payment receivable								$ 3.0			€ 2.8
Exchange rate on invoice	1.082	1.082						1.082			1.082
Contract CRO with Pharmaceutical Research Associates B.V.
Collaborative Arrangements
Bonus or malus maximum amount			€ 2.4								€ 3.4
Commitments amount payable for services received under contracts			€ 207.0						€ 223.8
BSA 2023 plan
Collaborative Arrangements
Number of BSA issued				10,000						10,000
AGA Plan 2023-1
Collaborative Arrangements
Number of BSA issued				300,000	300,000			300,000	300,000
PAGUP 2023
Collaborative Arrangements
Number of BSA issued				300,000	300,000			300,000	300,000