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Notes to the interim condensed consolidated statement of financial position - Shareholders' equity - Liquidity agreement (Details)			12 Months Ended
	Jan. 01, 2024	Jan. 01, 2023	Dec. 31, 2019
Notes to the interim condensed consolidated statement of financial position
Liquidity agreement term	12 months	12 months	12 months

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- Definition

Number of days used to determine liquidity agreement term in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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