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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
item
Segment Information  
Number of operating segments 1us-gaap_NumberOfOperatingSegments
Fair Value Measurements  
Collaborative Arrangements Technology Access Fee Payable in Cash Upon Specified Passage of Time $ 2.5ovas_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 2.5ovas_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 $ 2.5ovas_CollaborativeArrangementsTechnologyAccessFeePaidInCashUponSpecifiedPassageOfTime
/ us-gaap_CounterpartyNameAxis
= ovas_IntrexonIncMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_CollaborativeArrangementMember