XML 129 R117.htm IDEA: XBRL DOCUMENT v3.25.2

Current Liabilites - Lease Liabilities - Summary of Lease Amounts Recognized in Profit or Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Amounts recognized in profit or loss:
Depreciation expense on right-of-use asset	$ 84	$ 84	$ 84
Lease finance costs	8	6	5
Expense relating to leases of low value assets			2
Lease liability amounts recognized in profit and loss	$ 92	$ 90	$ 91

X

- Definition

The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 53
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_a&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_DepreciationRightofuseAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of the expense relating to leases of low-value assets accounted for applying paragraph 6 of IFRS 16. This expense shall not include the expense relating to short-term leases of low-value assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 53
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_d&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_ExpenseRelatingToLeasesOfLowvalueAssetsForWhichRecognitionExemptionHasBeenUsed
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of costs associated with financing activities of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 82
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_82_b&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_FinanceCosts
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amounts recognized in profit and loss.

+ References

No definition available.

+ Details

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

X

- Definition

Lease liability profit loss.

+ References

No definition available.

+ Details

Name:	opt_LeaseLiabilityProfitLoss
Namespace Prefix:	opt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration