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v3.25.3

Cash and Cash Equivalents - Additional Information (Detail) | Jun. 30, 2025 | Jun. 30, 2024
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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: |