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Key Management Personnel Disclosures - Additional Information (Detail)	12 Months Ended
	Jun. 30, 2023
Directors and other Key Management Personnel [member]
Disclosure of number and weighted average exercise price of outstanding share options [line items]
Number of shares granted	0

X

- Definition

The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2023-01-01
-Paragraph 45
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2023-01-01
-Paragraph 47
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2023-03-23

+ Details

Name:	ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Disclosure of number and weighted average exercise price of outstanding share option.

+ References

No definition available.

+ Details

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

X

- Details

Name:	immp_TitleOfIndividual1Axis=immp_DirectorsAndOtherKeyManagementPersonnelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: