XML 42 R30.htm IDEA: XBRL DOCUMENT v3.25.2

Current Assets - Prepayments

12 Months Ended

Jun. 30, 2025

Current prepayments [abstract]

Current Assets - Prepayments

Note 20. Current Assets - Prepayments

		June 30, 2025				June 30, 2024
		US$(000's)				US$(000's)
Launch Service Agreement			—				2,700
R&D Contract Research Organization			—				223
Insurance			608				609
Other prepayments			142				365
Total current prepayments			750				3,897

The insurance amount predominantly relates to directors and officers insurance.

X

- References

No definition available.

+ Details

Name:	ifrs-full_CurrentPrepaymentsAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The entire disclosure of current assets prepayments explanatory.

+ References

No definition available.

+ Details

Name:	opt_DisclosureOfCurrentAssetsPrepaymentsExplanatory
Namespace Prefix:	opt_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration