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Commitments - Summary of Expenditure Commitments Payable (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023
Commitments [Line Items]
Commercial commitments	$ 63	$ 47
Within One Year
Commitments [Line Items]
Commercial commitments	$ 63	$ 47

X

- Definition

Commercial commitments.

+ References

No definition available.

+ Details

Name:	opt_CommercialCommitments
Namespace Prefix:	opt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Commitments.

+ References

No definition available.

+ Details

Name:	opt_CommitmentsLineItems
Namespace Prefix:	opt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: