XML 56 R45.htm IDEA: XBRL DOCUMENT
v3.26.1

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

X
- References No definition available. + Details
Name: | onco_WarrantandDerivativeLiabilitiesScheduleofChangeintheFairValueoftheDerivativeLiabilitiesandWarrantLiabilitiesDetailsLineItems
Namespace Prefix: | onco_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=onco_DerivativeLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=onco_WarrantLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |