Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

No definition available.

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

Company Information - Milestone payment from AbbVie and French Research Tax Credits (CIR) (Details) - EUR (€) € in Millions	Apr. 21, 2022	Jan. 31, 2022	Dec. 31, 2021
Company Information
French Research Tax Credit (CIR), payments received	€ 3.6
AbbVie
Company Information
Milestone payments received		€ 4.0	€ 4.0