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

Other non-current assets - Advances payments - non-current (Details) - EUR (€) € in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Non Current Assets
Non-current advances to suppliers	€ 1,047	€ 895	€ 689
Contract CRO with Pharmaceutical Research Associates B.V.
Other Non Current Assets
Non-current advances to suppliers	€ 1,000