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The amount of residual interest in the assets of the entity after deducting all its liabilities.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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The increase (decrease) in the number of shares outstanding. [Refer: Number of shares outstanding]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The increase in equity through the issue of equity instruments.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares]

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The nominal value per share.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of cost related to the issuance of shares.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of gross proceeds from issuing shares.

No definition available.

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The increase (decrease) in equity resulting from the appropriation of a share issuance premium.

No definition available.

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The increase in shares resulting from the issuance of shares.

No definition available.

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Number of ATM emissions.

No definition available.

Name:	iva_NumberOfAtmEmissions
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Amount of proceeds from issuance of equity net of transaction costs.

No definition available.

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Reclassification of (Accumulated Deficit) Retained Earnings to Premium to Share Capital

No definition available.

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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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