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.

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from borrowings obtained. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2021-01-01
-Paragraph 17
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_17_c&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Period up to which the maturity term of the borrowings can be extended.

+ References

No definition available.

+ Details

Name:	iva_BorrowingsMaximumExtensionTerm
Namespace Prefix:	iva_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of loans obtained which are guaranteed by the french state.

+ References

No definition available.

+ Details

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

- Details

Name:	ifrs-full_BorrowingsByNameAxis=iva_FinancingFromSyndicateOfFrenchBanksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Company Information - Non-dilutive financing (Details) € in Thousands	1 Months Ended	12 Months Ended
	May 31, 2020 EUR (€) loan	Dec. 31, 2021	Dec. 31, 2020 EUR (€)
Disclosure of detailed information about borrowings [line items]
Loan obtained			€ 9,979
Financing from a syndicate of French banks
Disclosure of detailed information about borrowings [line items]
Loan obtained	€ 10,000
Number of loans obtained guaranteed by the french state \| loan	3
Extension of term of debt	4 years	4 years