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Accounting Principles - Leases contracts (Details) - EUR (€) | Dec. 31, 2020 | Jan. 01, 2019
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IFRS 16 |  |
Disclosure of initial application of standards or interpretations [line items] |  |
Underlying assets of leases not restated | € 5,000 | € 5,000

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The threshold amount for restating leases under IFRS 16. Leases with underlying assets under such threshold amount are not restated as they are covered by the exemptions permitted under the standard. + References No definition available. + Details
Name: | iva_IFRS16RestatementThreshold
Namespace Prefix: | iva_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | ifrs-full_InitiallyAppliedIFRSsAxis=iva_Ifrs16Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |