XML 127 R103.htm IDEA: XBRL DOCUMENT
v3.21.1

Provisions for Retirement Benefit Obligations - Sensitivity analysis (Details) - EUR (€) € in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Discount rate |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Percentage of reasonably possible increase in actuarial assumption | 0.25% |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption (as a percent) | 3.40% | 3.50% | 3.50%
Discount rate at 0.45% |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Benefit Obligation Percentage |  | 0.45% |
Benefit obligation at December 31 |  | € 1,168 |
Discount rate at 0.70% |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Benefit Obligation Percentage |  | 0.70% |
Benefit obligation at December 31 |  | € 1,127 |
Discount rate at 0.95% |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Benefit Obligation Percentage |  | 0.95% |
Benefit obligation at December 31 |  | € 1,088 |
Discount rate at 1.35% |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Benefit Obligation Percentage |  |  | 1.35%
Benefit obligation at December 31 |  |  | € 1,067
Discount rate at 1.60% |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Benefit Obligation Percentage |  |  | 1.60%
Benefit obligation at December 31 |  |  | € 1,029
Discount rate at 1.85% |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Benefit Obligation Percentage |  |  | 1.85%
Benefit obligation at December 31 |  |  | € 994
Discount rate at 0.10% |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Benefit Obligation Percentage | 0.10% |  |
Benefit obligation at December 31 | € 1,433 |  |
Discount rate at 0.35% |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Benefit Obligation Percentage | 0.35% |  |
Benefit obligation at December 31 | € 1,385 |  |
Discount rate at 0.60% |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Benefit Obligation Percentage | 0.60% |  |
Benefit obligation at December 31 | € 1,340 |  |

X
- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_DefinedBenefitObligationAtPresentValue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_145_a&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_PercentageOfReasonablyPossibleIncreaseInActuarialAssumption
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of benefit obligation percentage. + References No definition available. + Details
Name: | iva_BenefitObligationPercentage
Namespace Prefix: | iva_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. + References No definition available. + Details
Name: | iva_IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumptionPercent
Namespace Prefix: | iva_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_ActuarialAssumptionsAxis=ifrs-full_ActuarialAssumptionOfDiscountRatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ActuarialAssumptionsAxis=iva_ActuarialAssumptionOfDiscountRatesAt0.45PercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ActuarialAssumptionsAxis=iva_ActuarialAssumptionOfDiscountRatesAt0.70PercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ActuarialAssumptionsAxis=iva_ActuarialAssumptionOfDiscountRatesAt0.95PercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ActuarialAssumptionsAxis=iva_ActuarialAssumptionOfDiscountRatesAt1.35PercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ActuarialAssumptionsAxis=iva_ActuarialAssumptionOfDiscountRatesAt1.60PercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ActuarialAssumptionsAxis=iva_ActuarialAssumptionOfDiscountRatesAt1.85PercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ActuarialAssumptionsAxis=iva_ActuarialAssumptionOfDiscountRatesAt0.10PercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ActuarialAssumptionsAxis=iva_ActuarialAssumptionOfDiscountRatesAt0.35PercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ActuarialAssumptionsAxis=iva_ActuarialAssumptionOfDiscountRatesAt0.60PercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |