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Consolidated Statements of Stockholders' Equity (Deficit) (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Common Stock |  |
Common stock issued on private placement basis | $ 2,348 ovas_StockIssuedOnPrivatePlacementBasisIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 898 ovas_StockIssuedOnPrivatePlacementBasisIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Series A convertible preferred stock |  |
Preferred stock conversion ratio |  | (2.023)ovas_PreferredStockConversionRatioAfterReverseStockSplit / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Series B convertible preferred stock |  |
Issuance cost |  | $ 2,246 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Preferred stock conversion ratio |  | 1 ovas_PreferredStockConversionRatioAfterReverseStockSplit / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember

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- Definition The ratio applied for purposes of determining the number of shares of preferred stock that may be converted into one share of common stock, following the common stock Reverse Stock Split. + References No definition available. + Details
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- Definition Direct costs associated with issuing stock on private placement basis. + References No definition available. + Details
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Namespace Prefix: | ovas_
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Balance Type: | debit
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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Details
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- Details
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