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Non-Current Assets - Prepayments - Summary of Non-Current Assets - Prepayments (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Jun. 30, 2024
Disclosure Of Noncurrent Assets Prepayments [Abstract]
Prepayments		$ 467
Total non-current prepayments	$ 0	$ 467

X

- Definition

The amount of non-current prepayments. [Refer: Prepayments]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 78
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78_b&doctype=Standard
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Disclosure of Noncurrent Assets Prepayments.

+ References

No definition available.

+ Details

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

X

- Definition

Prepayment.

+ References

No definition available.

+ Details

Name:	opt_Prepayment
Namespace Prefix:	opt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant