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Related party transactions - Disclosure of transactions between related parties (Details) € in Thousands	6 Months Ended
	Jun. 30, 2024 EUR (€)
Related party transactions [abstract]
Collection	€ 1,657
Receivables	394
Payments	(3,342)
Liabilities	(3,926)
Net collection (payments)	(1,685)
Net receivables (liabilities)	€ (3,532)

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

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No definition available.

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

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No definition available.

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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No definition available.

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

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No definition available.

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

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Data Type:	xbrli:stringItemType
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Period Type:	duration

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- Definition

The net amounts of receivables (payable) resulting from related party transactions.

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Namespace Prefix:	inpha_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant