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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: |