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Subsequent Events (Details) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Subsequent events |  |  |  |
Net proceeds from the issuance of common stock | $ 124,100,000 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 51,733,000 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 32,414,000 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 4,039,000 us-gaap_ProceedsFromIssuanceOfCommonStock
Capitalized expenses incurred in public offering |  | 100,000 us-gaap_DeferredOfferingCosts |  |
Subsequent event |  |  |  |
Subsequent events |  |  |  |
Common stock issue price (in dollars per share) | $ 50.00 us-gaap_SharePrice / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Number of shares represents partial exercise of overallotment option granted to underwriters | 345,000 ovas_NumberOfSharesRepresentsPartialExerciseOfOverallotmentOptionGrantedToUnderwriters / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Net proceeds from the issuance of common stock | $ 124,100,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Subsequent event | Stock options |  |  |  |
Subsequent events |  |  |  |
Common stock issued (in shares) | 2,645,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_AwardTypeAxis = ovas_StockOptions1Member / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |

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- Definition Specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27011391&loc=d3e105025-122735 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section A + Details
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