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Subscription Agreement - Schedule of Activity for the Related Party Subscription Agreement Liability (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2025	Sep. 30, 2024
Schedule of Activity for the Related Party Subscription Agreement Liability [Abstract]
Balance at beginning		$ 804,000	$ 4,123,000	$ 4,123,000
Change in fair value		191,038	(3,319,000)
Settlement		(995,038)		995,038
Balance at ending			$ 804,000

X

- Definition

Change in fair value of subscription agreement liability.

+ References

No definition available.

+ Details

Name:	onco_ChangeInFairValueOfSubscriptionsAgreementLiability
Namespace Prefix:	onco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	onco_ScheduleOfActivityForTheRelatedPartySubscriptionAgreementLiabilityAbstract
Namespace Prefix:	onco_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Settlement of subscription agreement liability.

+ References

No definition available.

+ Details

Name:	onco_SettlementOfSubscriptionAgreementLiability
Namespace Prefix:	onco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the amount of subscription agreement liability to the related party.

+ References

No definition available.

+ Details

Name:	onco_SubscriptionAgreementLiabilityRelatedPartyCurrent
Namespace Prefix:	onco_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant