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Provisions for Retirement Benefit Obligations - Breakdown of expense recognized for the period (Details) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Provisions for Retirement Benefit Obligations
Expense for the period	€ 209	€ 1	€ 194
Service cost for the period	(202)	(195)	(192)
Interest cost for the period	(8)	(16)	(11)
Plan curtailments and modifications		157
Benefits for the period		53	9
Total	€ (209)	€ (1)	€ (194)

X

- References

No definition available.

+ Details

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X

- Definition

The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2020-01-01
-Paragraph 5
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_5&doctype=Standard
-URIDate 2020-01-01

+ Details

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Balance Type:	debit
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X

- Definition

Amount of benefits for the period attributable to defined benefit plan.

+ References

No definition available.

+ Details

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- Definition

Amount of gain (loss) recognized for plan curtailments and modifications related to defined benefit plan.

+ References

No definition available.

+ Details

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- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	iva_
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X

- Definition

Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

No definition available.

+ Details

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