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Consolidated Statements of Stockholders' Equity (Deficit) (USD $) In Thousands, except Share data, unless otherwise specified | Series A convertible preferred stock Convertible preferred stock USD ($) | Series A convertible preferred stock | Series B convertible preferred stock Convertible preferred stock USD ($) | Series B convertible preferred stock | Common Stock USD ($) | Additional paid-in capital USD ($) | Accumulated other comprehensive income (loss) USD ($) | Deficit accumulated during the development stage USD ($) | Total USD ($)
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Balance at Dec. 31, 2011 | $ 6,200 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ConvertiblePreferredStockMember |  |  |  | $ 1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 246 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | $ (2,624)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDeficitDuringDevelopmentStageMember | $ (2,377)us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2011 | 6,200,000 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ConvertiblePreferredStockMember |  |  |  | 1,209,752 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Issuance of convertible preferred stock, net of issuance costs of $2,246 at 2012 |  |  | 34,992 ovas_ConvertiblePreferredStockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ConvertiblePreferredStockMember |  |  |  |  |  |
Issuance of convertible preferred stock, net of issuance costs of $2,246 at 2012 (in shares) |  |  | 6,770,563 ovas_ConvertiblePreferredStockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ConvertiblePreferredStockMember |  |  |  |  |  |
Conversion of Series A preferred stock to common stock |  |  |  |  | 3 ovas_CommonSharesValueAttributableToConversionOfPreferredStockSeriesA / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 6,197 ovas_CommonSharesValueAttributableToConversionOfPreferredStockSeriesA / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 6,200 ovas_CommonSharesValueAttributableToConversionOfPreferredStockSeriesA
Common stock issued from the Conversion of Series A preferred stock to common stock (in shares) |  |  |  |  | 3,064,753 ovas_CommonSharesIssuedAttributableToConversionOfPreferredStockSeriesA / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Conversion of Series B preferred stock to common stock |  |  |  |  | 7 ovas_CommonSharesValueAttributableToConversionOfPreferredStockSeriesB / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 34,985 ovas_CommonSharesValueAttributableToConversionOfPreferredStockSeriesB / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 34,992 ovas_CommonSharesValueAttributableToConversionOfPreferredStockSeriesB
Common stock issued from the Conversion of Series B preferred stock to common stock (in shares) |  |  |  |  | 6,770,563 ovas_CommonSharesIssuedAttributableToConversionOfPreferredStockSeriesB / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Conversion of preferred stock to common stock | (6,200)ovas_IncrementalCommonSharesValueAttributableToConversionOfPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ConvertiblePreferredStockMember |  | (34,992)ovas_IncrementalCommonSharesValueAttributableToConversionOfPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ConvertiblePreferredStockMember |  |  |  |  |  |
Conversion of preferred stock to common stock (in shares) | (6,200,000)us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ConvertiblePreferredStockMember |  | (6,770,563)us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ConvertiblePreferredStockMember |  |  |  |  |  |
Common stock issued in a private placement, net of issuance costs of $2,348 at 2013 and $898 at 2012 |  |  |  |  | 1 ovas_StockIssuedValuePrivatePlacementBasis / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 4,038 ovas_StockIssuedValuePrivatePlacementBasis / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 4,039 ovas_StockIssuedValuePrivatePlacementBasis
Common stock issued in a private placement, net of issuance costs of $2,348 at 2013 and $898 at 2012 (in shares) |  |  |  |  | 897,554 ovas_StockIssuedSharesPrivatePlacementBasis / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Vesting of Founders Stock |  |  |  |  | 1 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 1 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
Vesting of Founders Stock (in shares) |  |  |  |  | 674,505 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Exercise of stock options (in shares) |  |  |  |  | 5,792 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock-based compensation expense |  |  |  |  |  | 1,382 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 1,382 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Unrealized gain (loss) on investments |  |  |  |  |  |  | (6)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | (6)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Net loss |  |  |  |  |  |  |  | (13,510)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDeficitDuringDevelopmentStageMember | (13,510)us-gaap_NetIncomeLoss
Balance at Dec. 31, 2012 |  |  |  |  | 13 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 46,848 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (6)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (16,134)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDeficitDuringDevelopmentStageMember | 30,721 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2012 |  |  |  |  | 12,622,919 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Common stock issued in a private placement, net of issuance costs of $2,348 at 2013 and $898 at 2012 |  |  |  |  | 4 ovas_StockIssuedValuePrivatePlacementBasis / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 32,652 ovas_StockIssuedValuePrivatePlacementBasis / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 32,656 ovas_StockIssuedValuePrivatePlacementBasis
Common stock issued in a private placement, net of issuance costs of $2,348 at 2013 and $898 at 2012 (in shares) |  |  |  |  | 3,888,880 ovas_StockIssuedSharesPrivatePlacementBasis / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance of shares to Intrexon |  |  |  |  |  | 2,500 ovas_StockIssuedValueUnderCollaborativeArrangement / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 2,500 ovas_StockIssuedValueUnderCollaborativeArrangement
Issuance of shares to Intrexon (in shares) |  |  |  |  | 273,224 ovas_StockIssuedSharesUnderCollaborativeArrangement / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Vesting of Founders Stock |  |  |  |  | 1 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 1 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
Vesting of Founders Stock (in shares) |  |  |  |  | 658,060 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Exercise of stock options |  |  |  |  |  | 42 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 42 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Exercise of stock options (in shares) |  |  |  |  | 42,799 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock-based compensation expense |  |  |  |  |  | 5,094 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 5,094 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Vesting of restricted stock |  |  |  |  |  | (285)us-gaap_RestrictedStockValueSharesIssuedNetOfTaxWithholdings / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (285)us-gaap_RestrictedStockValueSharesIssuedNetOfTaxWithholdings
Vesting of restricted stock (in shares) |  |  |  |  | 55,244 us-gaap_RestrictedStockSharesIssuedNetOfSharesForTaxWithholdings / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Unrealized gain (loss) on investments |  |  |  |  |  |  | 16 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 16 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Net loss |  |  |  |  |  |  |  | (29,044)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDeficitDuringDevelopmentStageMember | (29,044)us-gaap_NetIncomeLoss
Balance at Dec. 31, 2013 |  |  |  |  | 18 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 86,851 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 10 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (45,178)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDeficitDuringDevelopmentStageMember | 41,701 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2013 |  |  |  |  | 17,541,126 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Issuance of common stock under public offering, net of underwriters' discounts and issuance costs |  |  |  |  | 5 us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 51,728 us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 51,733 us-gaap_StockIssuedDuringPeriodValueOther
Issuance of common stock under public offering, net of underwriters' discounts and issuance costs (in shares) |  |  |  |  | 5,518,630 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Vesting of Founders Stock |  |  |  |  | 1 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 2 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
Vesting of Founders Stock (in shares) |  |  |  |  | 658,060 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Exercise of stock options |  |  |  |  |  | 163 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 163 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Exercise of stock options (in shares) |  |  |  |  | 308,150 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock-based compensation expense |  |  |  |  |  | 12,407 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 12,407 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Vesting of restricted stock |  |  |  |  |  | (1,125)us-gaap_RestrictedStockValueSharesIssuedNetOfTaxWithholdings / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (1,125)us-gaap_RestrictedStockValueSharesIssuedNetOfTaxWithholdings
Vesting of restricted stock (in shares) |  |  |  |  | 58,671 us-gaap_RestrictedStockSharesIssuedNetOfSharesForTaxWithholdings / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Unrealized gain (loss) on investments |  |  |  |  |  |  | (36)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | (36)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Net loss |  |  |  |  |  |  |  | (49,520)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDeficitDuringDevelopmentStageMember | (49,520)us-gaap_NetIncomeLoss
Balance at Dec. 31, 2014 |  |  |  |  | $ 24 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 150,025 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (26)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (94,698)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDeficitDuringDevelopmentStageMember | $ 55,325 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2014 |  |  |  |  | 24,084,637 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |

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