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Cash and Cash Equivalents - Additional Information (Detail)	Jun. 30, 2025	Jun. 30, 2024
Bottom of Range [member]
Disclosure of cash and cash equivalents [line items]
Interest rate	0.00%	0.00%
Top of Range [member]
Disclosure of cash and cash equivalents [line items]
Interest rate	4.20%	4.80%

X

- Definition

Line items represents cash and cash equivalents.

+ References

No definition available.

+ Details

Name:	immp_DisclosureOfCashAndCashEquivalentsLineItems
Namespace Prefix:	immp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Interest rate risk on deposits.

+ References

No definition available.

+ Details

Name:	immp_InterestRateOnDeposit
Namespace Prefix:	immp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: