Trade Payables and Other Current Liabilities - Summary of Other Current Liabilities (Details) - EUR (€) € in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Trade Payables and Other Current Liabilities
Employee-related payables	€ 1,866	€ 1,518	€ 1,405
Accrued payroll and other employeerelated taxes	1,340	1,234	1,375
VAT payable	2,128	879	753
Other accrued taxes and employeerelated expenses	140	178	106
Other miscellaneous payables	12	2,979	3,198
Other current liabilities	€ 5,485	€ 6,789	€ 6,838

The amount of current value added tax payables. [Refer: Value added tax payables]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 78
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_CurrentValueAddedTaxPayables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of current liabilities that the entity does not separately disclose in the same statement or note. [Refer: Current liabilities]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_OtherCurrentLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of current payables that the entity does not separately disclose in the same statement or note.

+ References

+ Details

Name:	ifrs-full_OtherCurrentPayables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the amount pertaining to accrued payroll and other employee related taxes.

+ References

No definition available.

+ Details

Name:	iva_AccruedPayrollAndOtherEmployeeRelatedTaxes
Namespace Prefix:	iva_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the amount pertaining to employee related payables.

+ References

No definition available.

+ Details

Name:	iva_EmployeeRelatedPayables
Namespace Prefix:	iva_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of accrued taxes and employee related expenses.

+ References

No definition available.

+ Details

Name:	iva_OtherAccruedTaxesAndEmployeeRelatedExpenses
Namespace Prefix:	iva_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	iva_TradePayablesAndOtherCurrentLiabilitiesAbstract
Namespace Prefix:	iva_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration