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