The amount of non-current liabilities that the entity does not separately disclose in the same statement or note. [Refer: Non-current liabilities]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard
-URIDate 2025-03-27

+ Details

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- Definition

Amount of increase (decrease) in employee related liabilities.

+ References

No definition available.

+ Details

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- Definition

Amount of increase (decrease) in other current liabilities of the entity.

+ References

No definition available.

+ Details

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

Amount of increase (decrease) in accrued salaries and other employee related taxes.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Increase (decrease) in current value added tax liabilities

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Amount of increase (decrease) in other accrued taxes and employee related expenses.

+ References

No definition available.

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

Amount of increase (decrease) in other miscellaneous current liabilities of the entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	iva_
Data Type:	xbrli:monetaryItemType
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- Definition

License agreement, issue of credit notes.

+ References

No definition available.

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

- Definition

License agreement, payables for credit notes to be issued.

+ References

No definition available.

+ Details

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

- Definition

Payables to social security and employee-benefit organizations relating to employer contributions to share-based payment plans.

+ References

No definition available.

+ Details

Name:	iva_PayablesToSocialSecurityAndEmployeeBenefitOrganizationsRelatingToEmployerContributionsToShareBasedPaymentPlans
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- References

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

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Notes to the unaudited interim condensed consolidated statement of financial position - Additional information (Details) € in Thousands, $ in Millions				6 Months Ended
	Jun. 01, 2026 USD ($)	Jan. 01, 2026 USD ($)	Jun. 01, 2025 USD ($)	Jun. 30, 2026 EUR (€)	Dec. 31, 2025 EUR (€)	Dec. 31, 2025 USD ($)
Other current and non-current liabilities
Other non-current liabilities				€ 1,339	€ 1,193
Decrease in other current liabilities				(2,300)
Decrease in other miscellaneous liabilities				(2,500)
Increase (decrease) in current value added tax liabilities				(500)
Accrued salaries and other employee related taxes				300
Increase (Decrease) in employee related liabilities				200
Increase (Decrease) in other accrued taxes and employee related expenses				200
Payables to social security and employee-benefit organizations relating to employer contributions to share-based payment plans				€ 1,000
Licensing and collaboration agreement with CTTQ
Other current and non-current liabilities
License agreement, payables for credit notes to be issued					€ 2,600	$ 3.0
License agreement, issue of credit notes \| $	$ 1.5	$ 1.5	$ 2.0