The amount of outstanding funds that the entity is obligated to repay.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_Borrowings
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

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

- Definition

The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2022-03-24
-Paragraph 47
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2022-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_LeaseLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of loans received.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_LoansReceived
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of non-current derivative financial liabilities. [Refer: Derivative financial liabilities]

+ References

+ Details

Name:	ifrs-full_NoncurrentDerivativeFinancialLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of borrowings that the entity does not separately disclose in the same statement or note. [Refer: Borrowings]

+ References

+ Details

Name:	ifrs-full_OtherBorrowings
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2022-03-24
-Paragraph 17
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_17_c&doctype=Standard
-URIDate 2022-03-24

+ Details

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

- Definition

Amended reimbursement period

+ References

No definition available.

+ Details

Name:	iva_AmendedReimbursementPeriod
Namespace Prefix:	iva_
Data Type:	xbrli:durationItemType
Balance Type:	na
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

Number of loans obtained by the company.

+ References

No definition available.

+ Details

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

- Definition

The amount of increase (decrease) in borrowings.

+ References

No definition available.

+ Details

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

- Details

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

- Details

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

- Details

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

Financial debt - Debt and borrowings (Details) € in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	May 31, 2020 EUR (€) loan	Sep. 30, 2022	Dec. 31, 2022 EUR (€)	Dec. 31, 2020 EUR (€)	Dec. 31, 2021 EUR (€)	Dec. 31, 2019 EUR (€)
Disclosure of detailed information about borrowings [line items]
Bank borrowings			€ 29,689	€ 9,992	€ 9,984
Derivatives instruments			9,876
Other loans and similar borrowings			316	62	6
Lease liabilities			4,510	2	130
Total debt			44,390	10,055	€ 10,119	€ 114
Increase (Decrease) in borrowings				9,900
Loan obtained			€ 30,209	€ 9,979
Financing from a syndicate of French banks
Disclosure of detailed information about borrowings [line items]
Number of loans obtained \| loan	3
Loan obtained	€ 10,000
Extension of term of debt	4 years			4 years
Loan agreements with syndicate of French banks, state guaranteed loan (Pret Garanti par l'Etat)
Disclosure of detailed information about borrowings [line items]
Amended reimbursement period		4 years
Societe Generale
Disclosure of detailed information about borrowings [line items]
Total debt				€ 13