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The increase in equity through the issue of equity instruments.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 106
-Subparagraph d
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_106_d_iii&doctype=Standard
-URIDate 2023-03-23

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 79
-Subparagraph a
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_79_a_iv&doctype=Standard
-URIDate 2023-03-23

Name:	ifrs-full_NumberOfSharesOutstanding
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Data Type:	xbrli:sharesItemType
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Period Type:	instant

The nominal value per share.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 79
-Subparagraph a
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_79_a_iii&doctype=Standard
-URIDate 2023-03-23

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The cash outflow for share issue costs.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2023-01-01
-Paragraph 17
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_17&doctype=Standard
-URIDate 2023-03-23

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

The cash inflow from issuing shares.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2023-01-01
-Paragraph 17
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_17_a&doctype=Standard
-URIDate 2023-03-23

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Data Type:	xbrli:monetaryItemType
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The increase in shares resulting from the issuance of shares.

No definition available.

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Data Type:	xbrli:sharesItemType
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The amount of net proceeds from issuing shares

No definition available.

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Number of ATM emissions.

No definition available.

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Balance Type:	na
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The number of shares issued during the period.

No definition available.

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Namespace Prefix:	iva_
Data Type:	xbrli:sharesItemType
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Period Type:	duration

The subscription price per warrant.

No definition available.

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Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

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Data Type:	na
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Data Type:	na
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