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Retirement Plans (Details)		12 Months Ended
	Jan. 01, 2022	Dec. 31, 2023
Retirement Plan [Abstract]
Permits voluntary contributions	100.00%
Percentage of gross pay		3.00%
Debt securities and cash rate		38.00%
Equity securities rate		26.00%
Alternative investments rate		12.00%
Real estate investments rate		24.00%
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]		Pension benefit obligation

X

- Definition

Alternative investments rate.

+ References

No definition available.

+ Details

Name:	onco_AlternativeInvestmentsRate
Namespace Prefix:	onco_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Debt securities and cash.

+ References

No definition available.

+ Details

Name:	onco_DebtSecuritiesAndCash
Namespace Prefix:	onco_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Equity securities rate.

+ References

No definition available.

+ Details

Name:	onco_EquitySecuritiesRate
Namespace Prefix:	onco_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of gross pay.

+ References

No definition available.

+ Details

Name:	onco_GrossPayPercentage
Namespace Prefix:	onco_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Real estate investments rate.

+ References

No definition available.

+ Details

Name:	onco_RealEstateInvestmentsRate
Namespace Prefix:	onco_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Indicates line item in statement of income or comprehensive income that includes components of net periodic benefit cost (credit), excluding service cost component, for defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-6

+ Details

Name:	us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostCreditExcludingServiceCostStatementOfIncomeOrComprehensiveIncomeExtensibleList
Namespace Prefix:	us-gaap_
Data Type:	enum2:enumerationSetItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of employer's matching contributions to a defined contribution plan that vests in a given year.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration