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Stock-Based Compensation (Details) (USD $) | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 | Apr. 30, 2011
2012 Plan |  |
Stock-based compensation |  |
Shares available for future issuance | 1,453,253 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = ovas_StockIncentivePlan2012Member |
2012 Plan | Maximum |  |
Stock-based compensation |  |
Annual increase to the maximum number of shares (or other type of equity) approved (usually by shareholders and board of directors) for awards under the equity-based compensation plan | 975,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = ovas_StockIncentivePlan2012Member / us-gaap_RangeAxis = us-gaap_MaximumMember |
Annual increase to the maximum number of shares (or other type of equity) approved (usually by shareholders and board of directors) for awards under the equity-based compensation plan, as a percentage of the number of shares of the entity's common stock then outstanding | 4.00%ovas_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualIncreaseInNumberOfSharesAuthorizedAsPercentageOfSharesOutstanding / us-gaap_PlanNameAxis = ovas_StockIncentivePlan2012Member / us-gaap_RangeAxis = us-gaap_MaximumMember |
2011 Plan | Maximum |  |
Stock-based compensation |  |
Shares available for future issuance | 679,622 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = ovas_EquityIncentivePlan2011Member / us-gaap_RangeAxis = us-gaap_MaximumMember |
Restricted stock purchase agreements | Founder |  |
Stock-based compensation |  |
Shares issued |  | 3,509,634 us-gaap_StockIssuedDuringPeriodSharesIssuedForServices / us-gaap_PlanNameAxis = ovas_RestrictedStockPurchaseAgreementsMember / us-gaap_TitleOfIndividualAxis = ovas_FounderMember
Purchase price (in dollars per share) |  | $ 0.002 us-gaap_SharePrice / us-gaap_PlanNameAxis = ovas_RestrictedStockPurchaseAgreementsMember / us-gaap_TitleOfIndividualAxis = ovas_FounderMember
Restricted stock purchase agreements | Three co-founders |  |
Stock-based compensation |  |
Number of co-founders |  | 3 ovas_NumberOfCoFounders / us-gaap_PlanNameAxis = ovas_RestrictedStockPurchaseAgreementsMember / us-gaap_TitleOfIndividualAxis = ovas_ThreeCoFoundersMember
Percentage of shares vesting on the grant date |  | 25.00%ovas_PercentageOfSharesVestingOnGrantDate / us-gaap_PlanNameAxis = ovas_RestrictedStockPurchaseAgreementsMember / us-gaap_TitleOfIndividualAxis = ovas_ThreeCoFoundersMember
Restricted stock purchase agreements | Two co-founders |  |
Stock-based compensation |  |
Number of co-founders |  | 2 ovas_NumberOfCoFounders / us-gaap_PlanNameAxis = ovas_RestrictedStockPurchaseAgreementsMember / us-gaap_TitleOfIndividualAxis = ovas_TwoCoFoundersMember
Percentage of the then-unvested shares that vested in connection with the Preferred Stock financing |  | 25.00%ovas_PercentageOfSharesVestingWithPreferredStockFinancing / us-gaap_PlanNameAxis = ovas_RestrictedStockPurchaseAgreementsMember / us-gaap_TitleOfIndividualAxis = ovas_TwoCoFoundersMember

X
- Definition Represents the number of co-founders. + References No definition available. + Details
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- Definition Represents the percentage of shares vesting on the grant date. + References No definition available. + Details
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- Definition Represents the percentage of the then-unvested shares that vested in connection with the Preferred Stock financing. + References No definition available. + Details
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- Definition Represents the annual increase to the maximum number of shares (or other type of equity) approved (usually by shareholders and board of directors) for awards under the equity-based compensation plan, as a percentage of the number of shares of the entity's common stock then outstanding. + References No definition available. + Details
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- Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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Balance Type: | na
Period Type: | instant

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- Definition Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders. + References No definition available. + Details
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- Details
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- Details
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