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Fair Value Measurements (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Technology access fee payable in cash upon specified passage of time	$ 2,500,000ovas_CollaborativeArrangementsTechnologyAccessFeePayableInCashUponSpecifiedPassageOfTime
Changes in the fair value of the level 3 technology access fee due to Intrexon
Transfers of assets from Level 1 to Level 2	0us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount	0us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount
Transfers of assets from Level 2 to Level 1	0us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount	0us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount
Transfers of liabilities from Level 1 to Level 2	0us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount	0us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount
Transfers of liabilities from Level 2 to Level 1	0us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount	0us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount
OvaTure Collaboration | Intrexon
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Technology access fee payable in cash upon specified passage of time	2,500,000ovas_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 due to Intrexon
Changes in the fair value of the level 3 technology access fee due to Intrexon
Balance at the beginning	2,186,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = ovas_TechnologyAccessFeeDueMember
Collaboration with Intrexon		2,174,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases / us-gaap_FairValueByLiabilityClassAxis = ovas_TechnologyAccessFeeDueMember
Fair value adjustment	314,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease / us-gaap_FairValueByLiabilityClassAxis = ovas_TechnologyAccessFeeDueMember	12,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease / us-gaap_FairValueByLiabilityClassAxis = ovas_TechnologyAccessFeeDueMember
Payments	(2,500,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements / us-gaap_FairValueByLiabilityClassAxis = ovas_TechnologyAccessFeeDueMember
Balance at the end		2,186,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = ovas_TechnologyAccessFeeDueMember
Short-term investments Member | Level 3
Assets:
Total	0us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember	0us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember
Fair value measurements on a recurring basis | Total
Assets:
Total	60,231,000us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember	44,427,000us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Liabilities:
Total liabilities		2,186,000us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Fair value measurements on a recurring basis | Level 1
Assets:
Total	6,414,000us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember	18,078,000us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Fair value measurements on a recurring basis | Level 2
Assets:
Total	53,817,000us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember	26,349,000us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Fair value measurements on a recurring basis | Level 3
Liabilities:
Total liabilities		2,186,000us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Fair value measurements on a recurring basis | Technology access fee due to Intrexon | Total
Liabilities:
Total liabilities		2,186,000us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByLiabilityClassAxis = ovas_TechnologyAccessFeeDueMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Fair value measurements on a recurring basis | Technology access fee due to Intrexon | Level 3
Liabilities:
Total liabilities		2,186,000us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = ovas_TechnologyAccessFeeDueMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Fair value measurements on a recurring basis | Cash and money market funds | Total
Assets:
Total	6,414,000us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = ovas_CashAndCashEquivalentsAndMoneyMarketFundsMember	18,078,000us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = ovas_CashAndCashEquivalentsAndMoneyMarketFundsMember
Fair value measurements on a recurring basis | Cash and money market funds | Level 1
Assets:
Total	6,414,000us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = ovas_CashAndCashEquivalentsAndMoneyMarketFundsMember	18,078,000us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = ovas_CashAndCashEquivalentsAndMoneyMarketFundsMember
Fair value measurements on a recurring basis | Corporate debt securities (including commercial paper) | Total
Assets:
Total	53,817,000us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = ovas_CorporateDebtSecuritiesAndCommercialPaperMember	26,349,000us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = ovas_CorporateDebtSecuritiesAndCommercialPaperMember
Fair value measurements on a recurring basis | Corporate debt securities (including commercial paper) | Level 2
Assets:
Total	$ 53,817,000us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = ovas_CorporateDebtSecuritiesAndCommercialPaperMember	$ 26,349,000us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = ovas_CorporateDebtSecuritiesAndCommercialPaperMember

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Represents the amount of technology access fee payable in cash upon specified passage of time under collaborative arrangement.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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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.

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Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial and nonfinancial obligations.

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