Company Information - Payments received from the Research Tax Credit (Details) € in Millions	Jun. 30, 2021 EUR (€)
Company Information
Amount of entire CIR received	€ 4.2
Amount of additional reimbursements of CIR	€ 3.8

Amount received from Research Tax Credit (CIR) relating to subcontracting expenses.

No definition available.

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