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Warrant and Derivative Liabilities - Schedule of Change in the Fair Value of the Derivative Liabilities and Warrant Liabilities (Details) - Fair Value, Recurring [Member] - USD ($)	3 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Derivative Liabilities [Member]
Schedule of Change in the Fair Value of the Derivative Liabilities and Warrant Liabilities [Line Items]
Balance	$ 625,555	$ 4,581,333
Change in fair value	(3,955,778)
Warrant Liabilities [Member]
Schedule of Change in the Fair Value of the Derivative Liabilities and Warrant Liabilities [Line Items]
Balance	331,424	$ 2,404,014
Change in fair value	$ (2,072,590)

X

- Definition

Amount of expense (income) related to adjustment to fair value of warrant liability.

+ References

No definition available.

+ Details

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Namespace Prefix:	onco_
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Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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X

- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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- Details

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