Additional non-refundable and non-creditable if the option is exercised.

No definition available.

Name:	ONCS_AdditionalNonrefundableAndNoncreditableOptionExercises
Namespace Prefix:	ONCS_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Cash to be received if option exercises.

+ References

No definition available.

+ Details

Name:	ONCS_CashToBeReceivedIfOptionExercises
Namespace Prefix:	ONCS_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Common shares to be issued if option exercises.

+ References

No definition available.

+ Details

Name:	ONCS_CommonSharesToBeIssuedIfOptionExercises
Namespace Prefix:	ONCS_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Liability under co-promotion agreement related party.

+ References

No definition available.

+ Details

Name:	ONCS_LiabilityUnderCoPromotionAgreementRelatedParties
Namespace Prefix:	ONCS_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Non-refundable payment.

+ References

No definition available.

+ Details

Name:	ONCS_NonrefundablePayment
Namespace Prefix:	ONCS_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Outstanding shares, percent.

+ References

No definition available.

+ Details

Name:	ONCS_OutstandingSharesPercent
Namespace Prefix:	ONCS_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Stock issued during period shares stock warrants exercised.

+ References

No definition available.

+ Details

Name:	ONCS_StockIssuedDuringPeriodSharesStockWarrantsExercised
Namespace Prefix:	ONCS_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromWarrantExercises
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ONCS_SirtexMedicalUSHoldingsIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=ONCS_ChinaGrandPharmaceuticalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Related Party Transactions (Details Narrative) - USD ($)				1 Months Ended	12 Months Ended
	Apr. 16, 2021	Jan. 25, 2021	Aug. 19, 2020	Jan. 31, 2021	Jul. 31, 2022	Jul. 31, 2021	Oct. 31, 2022
Proceeds from warrant exercises						$ 4,792,951
Sale of stock, price per share		$ 119.90
Ownership percentage				42.00%
Sirtex Medical US Holdings Inc [Member]
Number of shares issued for sale	12,817	30,811	18,173
Warrant exercise price per share	$ 75.90
Proceeds from warrant exercises	$ 1,000,000.0
Non refundable payment				$ 5,000,000.0
Additional non-refundable and non-creditable if the option is exercised				25,000,000.0
Cash to be received if the option is exercised				20,000,000.0
Common share to be issued, if the option are exercised				$ 5,000,000.0
Ownership percentage				8.00%
Liability under co-promotion agreement related party					$ 5,000,000.0		$ 5,000,000.0
China Grand Pharmaceutical & Healthcare Holdings Ltd [Member]
Number of shares issued for sale	64,084	154,054	90,864
Warrant exercise price per share	$ 75.90
Proceeds from warrant exercises	$ 4,800,000
Common Stock [Member]
Exercise of common stock warrants, shares						63,148
Number of shares issued for sale		350,513	209,481			209,481
Proceeds from warrant exercises						$ 4,800,000
Sale of stock, price per share		$ 119.90	$ 71.50
Common Stock [Member] \| China Grand Pharmaceutical & Healthcare Holdings Ltd [Member]
Warrant exercise price per share						$ 75.90
Proceeds from warrant exercises						$ 4,800,000