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Convertible Preferred Stock (Details) (USD $) | 0 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 29, 2012 | Dec. 31, 2012 | Aug. 13, 2012 | Jul. 31, 2011 | Dec. 31, 2014 | Aug. 13, 2012
Convertible preferred stock |  |  |  |  |  |
Gross proceeds |  | $ 34,992,000 us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock |  |  |  |
Reverse stock split conversion ratio | 2.0230 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 |  |  |  |  |
Series A convertible preferred stock |  |  |  |  |  |
Convertible preferred stock |  |  |  |  |  |
Shares issued |  |  |  | 6,200,000 ovas_ConvertiblePreferredStockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Issue price (in dollars per share) |  |  |  | $ 1.00 us-gaap_SharePrice / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Gross proceeds |  |  |  | 6,200,000 us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Issuance cost |  |  |  | 100,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Preferred stock, conversion ratio |  |  |  |  | 1 ovas_PreferredStockConvertibleConversionRatio / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |
Preferred stock, conversion ratio following Reverse Stock Split |  | (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 |  |  |  |  |  |
Convertible preferred 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 B convertible preferred stock |  |  |  |  |  |
Convertible preferred stock |  |  |  |  |  |
Shares issued | 6,770,563 ovas_ConvertiblePreferredStockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |
Issue price (in dollars per share) | 5.50 us-gaap_SharePrice / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |
Gross proceeds | 37,200,000 us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |
Issuance cost | 2,200,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |
Preferred stock, conversion ratio following Reverse Stock Split |  | 1 ovas_PreferredStockConversionRatioAfterReverseStockSplit / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Series B convertible preferred stock | Issuance under private placement |  |  |  |  |  |
Convertible preferred stock |  |  |  |  |  |
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
Preferred stock, conversion ratio following Reverse Stock Split |  |  |  |  |  | 1 ovas_PreferredStockConversionRatioAfterReverseStockSplit / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_TransactionTypeAxis = us-gaap_PrivatePlacementMember

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- Definition Number of new convertible preferred stock issued during the period. + References No definition available. + Details
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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 The ratio applied for purposes of determining the number of shares of preferred stock that may be converted into one share of common stock. + References No definition available. + Details
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- Definition Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible preferred stock using the if-converted method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 40 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1930-109256 + Details
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- Definition The cash inflow from issuance of preferred stocks identified as being convertible into another form of financial instrument, typically the entity's common stock. + 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 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Price of a single share of a number of saleable stocks of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Stock Split -URI http://asc.fasb.org/extlink&oid=6525746 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 + Details
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