Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The fair value of financial assets. [Refer: At fair value [member]; Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 25
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_25&doctype=Standard
-URIDate 2022-03-24

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The increase (decrease) in a financial instrument as a result of an increase (decrease) in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

The reasonably possible percentage of the increase (decrease) in the designated risk component used to determine the value of the financial instrument. Excludes defined benefit plan obligations.

+ References

No definition available.

+ Details

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Namespace Prefix:	iva_
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- Details

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- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Balance Type:
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- Details

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Data Type:	na
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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Data Type:	na
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- Details

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Financial Risk management - Exposure to foreign exchange risk - Sensitivity Analysis (Details) - EUR (€) € in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financial Risk Management
Fair value of financial assets	€ 90,014	€ 102,972	€ 120,417
Exposure to foreign exchange risk \| USD
Financial Risk Management
Percentage of reasonably possible increase (decrease) in risk assumption	5.00%
Inflation Risk \| Minimum
Financial Risk Management
Percentage of reasonably possible increase (decrease) in risk assumption	5.00%
Inflation Risk \| Maximum
Financial Risk Management
Percentage of reasonably possible increase (decrease) in risk assumption	10.00%
Cash and cash equivalents
Financial Risk Management
Fair value of financial assets	€ 86,736	86,553	105,687
Cash and cash equivalents \| Exposure to foreign exchange risk \| USD
Financial Risk Management
Fair value of financial assets	33,310
Impact of a 5% change in fair value	(1,586)
Short-term deposit accounts
Financial Risk Management
Fair value of financial assets	€ 1,048	€ 8,829	€ 7,336