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Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 item
Segment Information |
Number of operating segments | 1 us-gaap_NumberOfOperatingSegments
Fair Value Measurements |
Collaborative Arrangements Technology Access Fee Payable in Cash Upon Specified Passage of Time | $ 2.5 ovas_CollaborativeArrangementsTechnologyAccessFeePayableInCashUponSpecifiedPassageOfTime
Laboratory equipment | Minimum |
Property and equipment |
Estimated useful life of the asset | 3 years
Laboratory equipment | Maximum |
Property and equipment |
Estimated useful life of the asset | 5 years
Furniture |
Property and equipment |
Estimated useful life of the asset | 5 years
Computer equipment |
Property and equipment |
Estimated useful life of the asset | 3 years
OvaTure Collaboration | Intrexon |
Fair Value Measurements |
Collaborative Arrangements Technology Access Fee Payable in Cash Upon Specified Passage of Time | 2.5 ovas_CollaborativeArrangementsTechnologyAccessFeePayableInCashUponSpecifiedPassageOfTime / us-gaap_CounterpartyNameAxis = ovas_IntrexonIncMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember
Discount rate used in valuation of technology access fees payable (as a percent) | 15.00%us-gaap_FairValueInputsDiscountRate / us-gaap_CounterpartyNameAxis = ovas_IntrexonIncMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember
Technology access fee paid in cash upon specified passage of time | $ 2.5 ovas_CollaborativeArrangementsTechnologyAccessFeePaidInCashUponSpecifiedPassageOfTime / us-gaap_CounterpartyNameAxis = ovas_IntrexonIncMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember

X
- Definition Represents the amount of technology access fee paid in cash upon specified passage of time under collaborative arrangement. + References No definition available. + Details
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Namespace Prefix: | ovas_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount of technology access fee payable in cash upon specified passage of time under collaborative arrangement. + References No definition available. + Details
Name: | ovas_CollaborativeArrangementsTechnologyAccessFeePayableInCashUponSpecifiedPassageOfTime
Namespace Prefix: | ovas_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ovas_FairValueMeasurementsAbstract
Namespace Prefix: | ovas_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueInputsDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=ovas_LaboratoryEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ComputerEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=us-gaap_CollaborativeArrangementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |