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

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- Definition

Amount of increase (decrease) in employee related payables.

+ 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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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Amount of increase (decrease) in sales tax liabilities of the entity.

+ References

No definition available.

+ Details

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

- Definition

Liability for payroll taxes relating to taxes on share-based payment.

+ References

No definition available.

+ Details

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

License agreement, issue of credit notes.

+ References

No definition available.

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Balance Type:	credit
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- Definition

License agreement, payables for credit notes issued.

+ References

No definition available.

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- References

No definition available.

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Other current and non-current liabilities - Additional information (Details) € in Thousands, $ in Millions			1 Months Ended
	Jun. 01, 2026 USD ($)	Jan. 01, 2026 USD ($)	Jul. 31, 2025 USD ($)	Dec. 31, 2025 EUR (€)	Dec. 31, 2025 USD ($)	Sep. 30, 2025 EUR (€)	Dec. 31, 2024 EUR (€)	Dec. 31, 2023 EUR (€)
Other current and non-current liabilities
Other non-current liabilities				€ 1,193			€ 1,032	€ 1,032
Decrease in other current liabilities				9,400			1,400	1,700
Increase in employee-related payables				9,000			700
Decrease in other miscellaneous liabilities				2,400
Increase in VAT payable				(2,200)				€ 1,400
Liability for payroll taxes relating to taxes on share-based payment				9,000
Licensing and collaboration agreement with CTTQ
Other current and non-current liabilities
Other non-current liabilities				1,200			€ 1,000
License agreement, payables for credit notes issued				€ 2,600	$ 3.0	€ 2,600
License agreement, issue of credit notes \| $			$ 2.0
Licensing and collaboration agreement with CTTQ \| Forecast
Other current and non-current liabilities
License agreement, issue of credit notes \| $	$ 1.5	$ 1.5