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Income Tax Expense - Additional Information (Detail) - AUD ($)	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Deferred Tax Assets And Liabilities [line Items]
Cumulative tax losses	$ 221,070,595	$ 206,764,587

X

- Definition

Cumulative tax losses

+ References

No definition available.

+ Details

Name:	immp_CumulativeTaxLosses
Namespace Prefix:	immp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Deferred tax assets and liabilities line items

+ References

No definition available.

+ Details

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