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Company Information - Completion of a future currency contract (Details) $ in Millions |  | 1 Months Ended | 2 Months Ended
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Dec. 31, 2020 contract | Oct. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) item | Oct. 31, 2020 USD ($)
Company Information |  |  |  |
Number of future currency contracts completed | 3 |  | 2 |
Amount of future currency contracts completed |  | $ 20 | $ 40 | $ 60

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

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- Definition The notional amount of forward contracts completed during the period. + References No definition available. + Details
Name: | iva_NotionalAmountOfForwardContractsCompleted
Namespace Prefix: | iva_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of derivative contracts completed during the period. + References No definition available. + Details
Name: | iva_NumberOfDerivativeContractsCompleted
Namespace Prefix: | iva_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration