The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Contingent liabilities [member]; Financial assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 14
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_14_a&doctype=Standard
-URIDate 2021-03-24

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The hedging gains (losses) for hedge of group of items with offsetting risk positions.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 24C
-Subparagraph b
-Clause vi
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24C_b_vi&doctype=Standard
-URIDate 2021-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 9
-IssueDate 2021-01-01
-Paragraph 6.6.4
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2021-en-r&anchor=para_6.6.4&doctype=Standard
-URIDate 2021-03-24

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- Definition

The amount of commitment received.

+ References

No definition available.

+ Details

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

- Definition

The amount of increase in monthly rent.

+ References

No definition available.

+ Details

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

- Definition

The percentage of increase in annual rent.

+ References

No definition available.

+ Details

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Namespace Prefix:	iva_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of commitments related to future payments.

+ References

No definition available.

+ Details

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Namespace Prefix:	iva_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

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Namespace Prefix:	iva_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Net expense on change in fair value in financial income.

+ References

No definition available.

+ Details

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

- Definition

The period of assets given under rent.

+ References

No definition available.

+ Details

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

- Details

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Commitments - Commitments Received (Details) - EUR (€)				12 Months Ended
Commitments - Commitments Received (Details) - EUR (€)	Mar. 21, 2016	Nov. 04, 2015	Oct. 13, 2015	Dec. 31, 2021	Sep. 01, 2018	Mar. 30, 2018	Nov. 01, 2017	Jan. 01, 2017
Ifrs Collaborative Arrangement And Arrangement Other Than Collaborative Line items
Financial assets pledged as collateral for liabilities or contingent liabilities				€ 1,700,000
Hedging gains (losses) for hedge of group of items with offsetting risk positions				1,100,000
Net Expense On Change In Fair Value In Financial Income				700,000
Agreement with Novolyze \| Premises and facilities
Ifrs Collaborative Arrangement And Arrangement Other Than Collaborative Line items
Rental period			36 months
Amount of increase in monthly rent							€ 5,000
Annual increase of rent in percentage							2.00%
Amount of commitment received				73,000
Commitments Related to Future Payments				150,000
Agreement with Genoway \| Premises and facilities
Ifrs Collaborative Arrangement And Arrangement Other Than Collaborative Line items
Rental period		3 years
Agreement with Synthecob \| Research equipment and services
Ifrs Collaborative Arrangement And Arrangement Other Than Collaborative Line items
Rental period	2 years
Amount of increase in monthly rent					€ 2,700	€ 2,500		€ 2,400
Amount of commitment received				33,000
Commitments Related to Future Payments				€ 67,000