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Revenues and Other Income - Additional information (Details) - EUR (€) € in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2018
Ifrs Collaborative Arrangement And Arrangement Other Than Collaborative Line items
Milestone payments received				€ 0.0
AbbVie
Ifrs Collaborative Arrangement And Arrangement Other Than Collaborative Line items
Milestone payments received following the enrollment of first patient		€ 3.5
Milestone payments received			€ 0.0
Contribution to Company's revenue (as a percent)		51.40%
BI
Ifrs Collaborative Arrangement And Arrangement Other Than Collaborative Line items
Milestone payments received				€ 2.5
Contribution to Company's revenue (as a percent)		36.90%
Reversal of contract liabilities	€ 2.1	€ 2.2

X

- Definition

The percentage of the entity's revenue. [Refer: Revenue]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 8
-IssueDate 2020-01-01
-Paragraph 34
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_34&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_PercentageOfEntitysRevenue
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- Definition

Represents the milestone payments received following the enrollment of first patient in a collaborative arrangement.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the amount of reversal of contract liabilities recognized under IFRS 15.

+ References

No definition available.

+ Details

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

X

- 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

X

- Details

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

X

- Details

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