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v2.4.1.9

Common Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended |
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Mar. 29, 2012 | Jan. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2014 | Dec. 31, 2013 | Aug. 13, 2012 | Mar. 31, 2013 | Aug. 13, 2012 | Jul. 31, 2011
Common stock |  |  |  |  |  |  |  |  |  |  |
Reverse stock split conversion ratio | 2.0230 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 |  |  |  |  |  |  |  |  |  |
Net proceeds from secondary public offering |  | $ 124,100 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 51,733 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 32,414 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 4,039 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) |  |  |  |  |  | 5,518,630 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Common stock issued in a private placement (in shares) |  |  |  | 3,888,880 ovas_StockIssuedSharesPrivatePlacementBasis / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 897,554 ovas_StockIssuedSharesPrivatePlacementBasis / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Common stock issue price (in dollars per share) |  |  |  |  |  | $ 10.00 us-gaap_SharePrice / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Net proceeds from secondary public offering |  |  |  |  |  | 51,700 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Common stock issued in conjunction with a research and development agreement (in shares) |  |  |  | 273,224 ovas_StockIssuedSharesUnderCollaborativeArrangement / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Outstanding stock options (in shares) |  |  | 3,628,628 ovas_CommonStockSharesReservedForPotentialConversionOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 2,413,237 ovas_CommonStockSharesReservedForPotentialConversionOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 2,413,237 ovas_CommonStockSharesReservedForPotentialConversionOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Outstanding restricted stock units (in shares) |  |  | 54,078 ovas_CommonStockSharesReservedForPotentialConversionOfRestrictedStockUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 96,155 ovas_CommonStockSharesReservedForPotentialConversionOfRestrictedStockUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 96,155 ovas_CommonStockSharesReservedForPotentialConversionOfRestrictedStockUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Number of shares represents partial exercise of overallotment option granted to underwriters |  |  |  |  |  | 518,630 ovas_NumberOfSharesRepresentsPartialExerciseOfOverallotmentOptionGrantedToUnderwriters / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Common Stock | Intrexon |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |
Common stock issue price (in dollars per share) |  |  |  | $ 9.15 us-gaap_SharePrice / us-gaap_CounterpartyNameAxis = ovas_IntrexonIncMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | $ 9.15 us-gaap_SharePrice / us-gaap_CounterpartyNameAxis = ovas_IntrexonIncMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Common stock issued in conjunction with a research and development agreement (in shares) |  |  |  |  |  |  | 273,224 ovas_StockIssuedSharesUnderCollaborativeArrangement / us-gaap_CounterpartyNameAxis = ovas_IntrexonIncMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance under private placement | Common Stock |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |
Common stock issued in a private placement (in shares) |  |  |  |  |  |  |  | 897,554 ovas_StockIssuedSharesPrivatePlacementBasis / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_TransactionTypeAxis = us-gaap_PrivatePlacementMember | 3,888,880 ovas_StockIssuedSharesPrivatePlacementBasis / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_TransactionTypeAxis = us-gaap_PrivatePlacementMember |  |
Common stock issue price (in dollars per share) |  |  |  |  |  |  |  | $ 5.50 us-gaap_SharePrice / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_TransactionTypeAxis = us-gaap_PrivatePlacementMember | $ 9.00 us-gaap_SharePrice / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_TransactionTypeAxis = us-gaap_PrivatePlacementMember | 5.50 us-gaap_SharePrice / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_TransactionTypeAxis = us-gaap_PrivatePlacementMember |
Net proceeds from secondary public offering |  |  |  |  |  |  |  | $ 4,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_TransactionTypeAxis = us-gaap_PrivatePlacementMember | $ 32,700 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_TransactionTypeAxis = us-gaap_PrivatePlacementMember |  |
Series A convertible preferred stock |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |
Common stock issue price (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 1.00 us-gaap_SharePrice / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Preferred stock conversion ratio |  |  |  |  | (2.023)ovas_PreferredStockConversionRatioAfterReverseStockSplit / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  | 2.023 ovas_PreferredStockConversionRatioAfterReverseStockSplit / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |
Series A convertible preferred stock | Issuance under private placement |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock in which preferred stock is convertible |  |  |  |  |  |  |  | 3,064,753 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_TransactionTypeAxis = us-gaap_PrivatePlacementMember |  |  |
Series A convertible preferred stock | Issuance under private placement | Common Stock |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock in which preferred stock is convertible |  |  |  |  |  |  |  | 3,064,753 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock / us-gaap_AwardTypeAxis = us-gaap_CommonStockMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_TransactionTypeAxis = us-gaap_PrivatePlacementMember |  |  |
Series A convertible preferred stock | Issuance under private placement | Common Stock |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |
Reverse stock split conversion ratio |  |  |  |  |  |  |  | 2.023 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_TransactionTypeAxis = us-gaap_PrivatePlacementMember |  |  |
Series B convertible preferred stock |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |
Common stock issue price (in dollars per share) | 5.50 us-gaap_SharePrice / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  |  |  |
Preferred stock conversion ratio |  |  |  |  | 1 ovas_PreferredStockConversionRatioAfterReverseStockSplit / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |
Series B convertible preferred stock | Issuance under private placement |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |
Preferred stock conversion ratio |  |  |  |  |  |  |  | 1 ovas_PreferredStockConversionRatioAfterReverseStockSplit / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_TransactionTypeAxis = us-gaap_PrivatePlacementMember |  |  |
Number of shares of common stock in which preferred stock is convertible |  |  |  |  |  |  |  | 6,770,563 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_TransactionTypeAxis = us-gaap_PrivatePlacementMember |  |  |
Series B convertible preferred stock | Issuance under private placement | Common Stock |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock in which preferred stock is convertible |  |  |  |  |  |  |  | 6,770,563 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock / us-gaap_AwardTypeAxis = us-gaap_CommonStockMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_TransactionTypeAxis = us-gaap_PrivatePlacementMember |  |  |

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