The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_105&doctype=Standard
-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 116
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_116_a&doctype=Standard
-URIDate 2020-01-01

+ Details

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

- Definition

The amount of current contract liabilities. [Refer: Contract liabilities]

+ References

+ Details

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

- 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_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of non-current contract liabilities. [Refer: Contract liabilities]

+ References

+ Details

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

- Definition

The amount of remaining contract liabilities.

+ References

No definition available.

+ Details

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

- Definition

Represents the milestone payments received recognized as revenue.

+ References

No definition available.

+ Details

Name:	iva_CollaborativeArrangementMilestonePaymentRecognizedInRevenue
Namespace Prefix:	iva_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the cumulative amount of research funding received in a collaborative arrangement.

+ References

No definition available.

+ Details

Name:	iva_CollaborativeArrangementMilestonePaymentsReceived
Namespace Prefix:	iva_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the amount of reversal of contract liabilities recognized under IFRS 15.

+ References

No definition available.

+ Details

Name:	iva_CollaborativeArrangementReversalOfContractLiabilities
Namespace Prefix:	iva_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of difference between payment received and revue recognized related to research fees.

+ References

No definition available.

+ Details

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

- Definition

The amount of revenue to be recognized.

+ References

No definition available.

+ Details

Name:	iva_RevenueToBeRecognized
Namespace Prefix:	iva_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	iva_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeAxis=iva_ResearchAndDevelopmentCollaborationWithBoehringerIngelheimMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	iva_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeAxis=iva_ResearchCollaborationWithAbbvieMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	iva_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeAxis=iva_ResearchAndDevelopmentCollaborationWithEnyopharmaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Contract Liabilities (Details) - EUR (€) € in Thousands	3 Months Ended	12 Months Ended
Contract Liabilities (Details) - EUR (€) € in Thousands	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Disclosure of disaggregation of revenue from contracts with customers [line items]
Shortterm contract liabilities			€ 548
Longterm contract liabilities			1,673
Total contract liabilities			2,221
Revenue to be recognized			7,915
Milestone payment			0
BI
Disclosure of disaggregation of revenue from contracts with customers [line items]
Shortterm contract liabilities			436
Longterm contract liabilities			1,673
Total contract liabilities			2,109
Revenue to be recognized			7,718
Contract liabilities reversed	€ 2,100	€ 2,200
Milestone payment			2,500
Milestone payment recognized in revenue		€ 700	200
Contract liabilities booked			1,800
Contract liabilities related to research fees			300
AbbVie
Disclosure of disaggregation of revenue from contracts with customers [line items]
Shortterm contract liabilities			15
Total contract liabilities			15
Revenue to be recognized			100
Milestone payment				€ 0
Contract liabilities related to research fees			15
EnyoParma
Disclosure of disaggregation of revenue from contracts with customers [line items]
Shortterm contract liabilities			97
Total contract liabilities			97
Revenue to be recognized			97
Contract liabilities related to research fees			€ 100