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Company Information - Reinvestment of short-term USD deposits (Details) $ in Millions | 1 Months Ended | 2 Months Ended
--- | --- | ---
Nov. 30, 2020 item | Oct. 31, 2020 USD ($)
Company Information |  |
Reinvestment of short-term USD deposits | $ |  | $ 9
Number of short-term deposits | item | 2 |

X
- References No definition available. + Details
Name: | iva_CompanyInformationAbstract
Namespace Prefix: | iva_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of short-term deposits of the company. + References No definition available. + Details
Name: | iva_NumberOfShortTermDeposits
Namespace Prefix: | iva_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of short-term deposits reinvested during the period. + References No definition available. + Details
Name: | iva_ReinvestmentOfShortTermDeposits
Namespace Prefix: | iva_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration