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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 | $ 2,500,000 ovas_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 | 0 us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount | 0 us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount
Transfers of assets from Level 2 to Level 1 | 0 us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount | 0 us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount
Transfers of liabilities from Level 1 to Level 2 | 0 us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount | 0 us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount
Transfers of liabilities from Level 2 to Level 1 | 0 us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount | 0 us-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 | 2,500,000 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 due to Intrexon |  |
Changes in the fair value of the level 3 technology access fee due to Intrexon |  |
Balance at the beginning | 2,186,000 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = ovas_TechnologyAccessFeeDueMember |
Collaboration with Intrexon |  | 2,174,000 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases / us-gaap_FairValueByLiabilityClassAxis = ovas_TechnologyAccessFeeDueMember
Fair value adjustment | 314,000 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease / us-gaap_FairValueByLiabilityClassAxis = ovas_TechnologyAccessFeeDueMember | 12,000 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease / us-gaap_FairValueByLiabilityClassAxis = ovas_TechnologyAccessFeeDueMember
Payments | (2,500,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements / us-gaap_FairValueByLiabilityClassAxis = ovas_TechnologyAccessFeeDueMember |
Balance at the end |  | 2,186,000 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = ovas_TechnologyAccessFeeDueMember
Short-term investments Member | Level 3 |  |
Assets: |  |
Total | 0 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | 0 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember
Fair value measurements on a recurring basis | Total |  |
Assets: |  |
Total | 60,231,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 44,427,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Liabilities: |  |
Total liabilities |  | 2,186,000 us-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 | 6,414,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 18,078,000 us-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 | 53,817,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 26,349,000 us-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 |  | 2,186,000 us-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 |  | 2,186,000 us-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 |  | 2,186,000 us-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 | 6,414,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = ovas_CashAndCashEquivalentsAndMoneyMarketFundsMember | 18,078,000 us-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 | 6,414,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = ovas_CashAndCashEquivalentsAndMoneyMarketFundsMember | 18,078,000 us-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 | 53,817,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = ovas_CorporateDebtSecuritiesAndCommercialPaperMember | 26,349,000 us-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 | $ 53,817,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = ovas_CorporateDebtSecuritiesAndCommercialPaperMember | $ 26,349,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = ovas_CorporateDebtSecuritiesAndCommercialPaperMember

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + 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 (bb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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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
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- Definition 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. + 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 (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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