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Stock-Based Compensation (Details 2) (USD $) | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended
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Dec. 31, 2014 | Dec. 09, 2014 | Dec. 05, 2012 | Mar. 20, 2013 | Dec. 05, 2012 | Dec. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014
Aggregate intrinsic value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Development stage product development revenues | $ 0 us-gaap_DevelopmentStageEnterpriseDeficitAccumulatedDuringDevelopmentStage |  |  |  |  |  |  |  |  | 0 us-gaap_DevelopmentStageEnterpriseDeficitAccumulatedDuringDevelopmentStage |  |  |  |  |  |  |  | $ 0 us-gaap_DevelopmentStageEnterpriseDeficitAccumulatedDuringDevelopmentStage
Additional disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation cost, net of estimated forfeitures, related to unvested stock options and restricted stock units (in dollars) | 27,300,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |  |  |  |  |  |  | 27,300,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |  |  |  |  |  | 27,300,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Weighted average period for recognition of compensation cost related to unvested stock awards | 2 years 10 months 24 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service based restricted stock units | 2012 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation cost, net of estimated forfeitures, related to unvested stock options and restricted stock units (in dollars) | 1,000,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_PlanNameAxis = ovas_StockIncentivePlan2012Member / us-gaap_VestingAxis = ovas_VestingBasedOnServiceMember |  |  |  |  |  |  |  |  | 1,000,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_PlanNameAxis = ovas_StockIncentivePlan2012Member / us-gaap_VestingAxis = ovas_VestingBasedOnServiceMember |  |  |  |  |  |  |  | 1,000,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_PlanNameAxis = ovas_StockIncentivePlan2012Member / us-gaap_VestingAxis = ovas_VestingBasedOnServiceMember
Weighted average period for recognition of compensation cost related to unvested stock awards | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service based restricted stock units | CEO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 30,902 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = ovas_VestingBasedOnServiceMember | 128,205 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = ovas_VestingBasedOnServiceMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ 8.75 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = ovas_VestingBasedOnServiceMember | $ 32.36 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = ovas_VestingBasedOnServiceMember | $ 7.80 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = ovas_VestingBasedOnServiceMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance based restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | 0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_VestingAxis = ovas_VestingBasedOnPerformanceMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance based restricted stock units | CEO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 23,176 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = ovas_VestingBasedOnPerformanceMember | 64,103 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = ovas_VestingBasedOnPerformanceMember |  |  | 32,051 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = ovas_VestingBasedOnPerformanceMember |  |  |  |  |  |  |  |  |  |  |  |
Vested (in shares) |  |  |  |  |  | (19,230)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = ovas_VestingBasedOnPerformanceMember |  |  |  |  |  |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  |  | $ 10.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = ovas_VestingBasedOnPerformanceMember | $ 8.75 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = ovas_VestingBasedOnPerformanceMember |  |  |  |  |  |  |  |  |  |  |  |  |
Founder |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested at the beginning of the period (in shares) | 987,081 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = ovas_FounderMember |  |  |  |  |  | 1,645,141 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = ovas_FounderMember |  |  |  |  |  | 987,081 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = ovas_FounderMember |  |  |  | 1,645,141 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = ovas_FounderMember |
Vested (in shares) | (658,060)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = ovas_FounderMember |  |  |  |  |  | (658,060)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = ovas_FounderMember |  |  |  |  |  |  |  |  |  |  |
Unvested at the end of the period (in shares) | 329,021 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = ovas_FounderMember |  |  |  |  | 987,081 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = ovas_FounderMember | 987,081 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = ovas_FounderMember | 1,645,141 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = ovas_FounderMember | 987,081 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = ovas_FounderMember | 329,021 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = ovas_FounderMember |  |  |  | 987,081 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = ovas_FounderMember |  |  |  | 329,021 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = ovas_FounderMember
Additional disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | 7,500,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ovas_FounderMember |  |  |  |  |  | 1,400,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ovas_FounderMember | 800,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ovas_FounderMember |  |  |  |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) | 2,413,237 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  |  |  |  |  | 2,413,237 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |
Granted (in shares) | 2,464,138 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercised (in shares) | (370,808)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeited (in shares) | (852,564)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cancelled (in shares) | (25,375)ovas_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledInPeriod / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period (in shares) | 3,628,628 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  | 2,413,237 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = ovas_StockOptions1Member | 2,413,237 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  | 2,413,237 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = ovas_StockOptions1Member | 3,628,628 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  | 2,413,237 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  | 3,628,628 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = ovas_StockOptions1Member
Exercisable at the end of the period (in shares) | 688,562 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  |  | 688,562 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  | 688,562 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = ovas_StockOptions1Member
Vested and expected to vest at the end of the period (in shares) | 2,394,044 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  |  | 2,394,044 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  | 2,394,044 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber / us-gaap_AwardTypeAxis = ovas_StockOptions1Member
Weighted average exercise price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 9.26 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  |  |  |  |  | 9.26 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |
Granted (in dollars per share) | $ 19.12 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercised (in dollars per share) | $ 3.81 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeited (in dollars per share) | $ 11.51 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cancelled (in dollars per share) | $ 5.48 ovas_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsCancelledInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of period (in dollars per share) | $ 16.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  | 9.26 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member | $ 9.26 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  | $ 9.26 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member | 16.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  | 9.26 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  | $ 16.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member
Exercisable at the end of the period (in dollars per share) | $ 8.43 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  |  | 8.43 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  | $ 8.43 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member
Vested and expected to vest at the end of the period (in dollars per share) | $ 15.11 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  |  | 15.11 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  | $ 15.11 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member
Weighted average remaining contractual term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period | 9 years 1 month 10 days |  |  |  |  |  |  |  | 9 years 18 days |  |  |  |  |  |  |  |  |
Outstanding at the end of the period | 9 years 1 month 10 days |  |  |  |  |  |  |  | 9 years 18 days |  |  |  |  |  |  |  |  |
Exercisable at the end of the period | 8 years 26 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested and expected to vest at the end of the period | 9 years 4 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period | 6,087,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  |  |  |  |  | 6,087,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |
Outstanding at the end of period | 102,355,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  | 6,087,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = ovas_StockOptions1Member | 6,087,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  | 6,087,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = ovas_StockOptions1Member | 102,355,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  | 6,087,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  | 102,355,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = ovas_StockOptions1Member
Exercisable at the end of period | 24,641,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  |  | 24,641,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  | 24,641,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 / us-gaap_AwardTypeAxis = ovas_StockOptions1Member
Vested and expected to vest at the end of the period | 69,692,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  |  | 69,692,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  | 69,692,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue / us-gaap_AwardTypeAxis = ovas_StockOptions1Member
Total intrinsic value | 4,200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  | 400,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = ovas_StockOptions1Member | 48,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = ovas_StockOptions1Member |  |  |  |  |  |  |  |  |  |
Stock options | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumptions used to estimate fair value of each stock-based option award on the grant date using the Black-Scholes option pricing model |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk free interest rate (as a percent) | 1.62%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  | 0.91%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_RangeAxis = us-gaap_MinimumMember | 0.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |  |  |
Volatility (as a percent) | 76.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  | 83.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_RangeAxis = us-gaap_MinimumMember | 79.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |  |  |
Expected term | 5 years 3 months 18 days |  |  |  |  |  | 5 years 1 month 6 days | 5 years 1 month 6 days |  |  |  |  |  |  |  |  |  |
Stock options | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumptions used to estimate fair value of each stock-based option award on the grant date using the Black-Scholes option pricing model |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk free interest rate (as a percent) | 2.17%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  | 2.11%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_RangeAxis = us-gaap_MaximumMember | 1.78%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |  |
Volatility (as a percent) | 84.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  | 91.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_RangeAxis = us-gaap_MaximumMember | 89.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |  |
Expected term | 9 years 11 months 19 days |  |  |  |  |  | 9 years 11 months 5 days | 9 years 11 months 5 days |  |  |  |  |  |  |  |  |  |
Stock options | Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) | 2,434,138 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_TitleOfIndividualAxis = ovas_EmployeeMember |  |  |  |  |  | 1,537,172 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_TitleOfIndividualAxis = ovas_EmployeeMember |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ 19.19 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_TitleOfIndividualAxis = ovas_EmployeeMember |  |  |  |  |  | $ 12.87 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_TitleOfIndividualAxis = ovas_EmployeeMember |  |  |  |  |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average grant-date fair value of options granted (in dollars per share) | $ 13.41 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_TitleOfIndividualAxis = ovas_EmployeeMember |  |  |  |  |  | $ 9.34 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_TitleOfIndividualAxis = ovas_EmployeeMember |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | 3,300,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_TitleOfIndividualAxis = ovas_EmployeeMember |  |  |  |  |  | 2,300,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_TitleOfIndividualAxis = ovas_EmployeeMember | 300,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_TitleOfIndividualAxis = ovas_EmployeeMember |  |  |  |  |  |  |  |  |  |
Stock options | Non-employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) | 30,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_TitleOfIndividualAxis = ovas_NonEmployeeMember |  |  |  |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_TitleOfIndividualAxis = ovas_NonEmployeeMember |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ 13.26 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_TitleOfIndividualAxis = ovas_NonEmployeeMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | 8,300,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_TitleOfIndividualAxis = ovas_NonEmployeeMember |  |  |  |  |  | 2,200,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_TitleOfIndividualAxis = ovas_NonEmployeeMember | 1,000,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_TitleOfIndividualAxis = ovas_NonEmployeeMember |  |  |  |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested in period fair value |  |  |  |  |  |  | 800,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | 800,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  | 700,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 36,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |  |  |  |
Restricted stock units | CEO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 54,078 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember | 192,308 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested (in shares) |  |  |  |  |  |  |  |  |  | 16,025 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember | 16,025 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember | 16,025 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember | 16,025 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember | 16,025 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember | 16,025 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember | 16,025 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember | 16,025 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember |
Restricted stock units | CEO | Vesting on March 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested (in shares) |  | 3,863 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / ovas_VestingScheduleAxis = ovas_VestingInMarch2015Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units | CEO | Vesting quarterly until December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested (in shares) |  | 3,863 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / ovas_VestingScheduleAxis = ovas_VestingInDecember2016Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units | Service based restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = ovas_VestingBasedOnServiceMember

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