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Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Shared Facilities and Service Agreement [Abstract]
Minimum fixed payments due under the shared facilities agreement	$ 131
Current Liabilities [Member]
Shared Facilities and Service Agreement [Abstract]
Allocated use fees payable	2,100	$ 2,900
General and Administrative Expenses [Member]
Shared Facilities and Service Agreement [Abstract]
Allocated use fees	268	790	$ 595
Research and Development [Member]
Shared Facilities and Service Agreement [Abstract]
Allocated use fees	1,100	691	565
Sales and Marketing Expenses [Member]
Shared Facilities and Service Agreement [Abstract]
Allocated use fees	$ 213	$ 0	$ 0
BioTime, Inc. [Member]
Shared Facilities and Service Agreement [Abstract]
Markup rate on allocated costs	5.00%
Term of payment	30 days
Interest rate charged on unpaid and overdue invoices	15.00%

X

- Definition

The sum of expenses charged to the entity by the parent company for services provided by the parent and for the shared use of a common facility under a "Shared Facilities and Services Agreement". The fees are allocated proportionally for costs incurred during the period by the entity.

+ References

No definition available.

+ Details

Name:	ocx_AllocatedServicesAndFacilityUseFeeExpense
Namespace Prefix:	ocx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The sum of amounts payable for charges to the entity by the parent company for services provided by the parent and for the shared use of a common facility under a "Shared Facilities and Services Agreement". The fees are allocated proportionally for costs incurred during the period by the entity.

+ References

No definition available.

+ Details

Name:	ocx_AllocatedServicesAndFacilityUseFeePayable
Namespace Prefix:	ocx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the percentage of interest charged on invoices not paid when due.

+ References

No definition available.

+ Details

Name:	ocx_InterestOnUnpaidOverdueInvoice
Namespace Prefix:	ocx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The periodic minimum payment due under the Shared Facility Agreement for amounts payable for charges to the entity by the parent company for services provided by the parent and for the shared use of a common facility.

+ References

No definition available.

+ Details

Name:	ocx_MinimumFixedPaymentDueSharedFacilityAgreement
Namespace Prefix:	ocx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The percentage markup of the fee for the services and usage of facilities, equipment, and supplies aforementioned which shall be paid by the entity under Shared Facilities Agreement.

+ References

No definition available.

+ Details

Name:	ocx_PercentageOfMarkupFeeAllocatedButNotCharged
Namespace Prefix:	ocx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	ocx_SharedFacilitiesAndServiceAgreementAbstract
Namespace Prefix:	ocx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the maximum number of days upon the receipt of an invoice within which the invoice must be paid, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	ocx_TermOfPayment
Namespace Prefix:	ocx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=ocx_CurrentLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_ResearchAndDevelopmentExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_SellingAndMarketingExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=us-gaap_ParentCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: