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v2.4.1.9

Related Party Transactions (Details) | 1 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Jun. 30, 2014 | Dec. 31, 2012 | Dec. 31, 2011 item
Related Party Transactions |  |  |  |
Number of principal stockholders for which chief executive officer serves as a general partner | 1 ovas_NumberOfPrincipalStockholdersForWhichChiefExecutiveOfficerServesAsAGeneralPartner |  |  |
Number of principal stockholders from whom the entity has leased office space |  |  |  | 1 ovas_NumberOfPrincipalStockholdersFromWhomEntityHasLeasedOfficeSpace
CEO | Stock option |  |  |  |
Related Party Transactions |  |  |  |
Granted (in shares) | 200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ChiefExecutiveOfficerMember | 500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ChiefExecutiveOfficerMember | 339,313 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ChiefExecutiveOfficerMember |
CEO | Restricted stock units |  |  |  |
Related Party Transactions |  |  |  |
Granted (in shares) | 54,078 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ChiefExecutiveOfficerMember |  | 192,308 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ChiefExecutiveOfficerMember |

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- Definition Represents the number of principal stockholders of the entity for which the entity's chief executive officer serves as a general partner. + References No definition available. + Details
Name: | ovas_NumberOfPrincipalStockholdersForWhichChiefExecutiveOfficerServesAsAGeneralPartner
Namespace Prefix: | ovas_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of principal stockholders of the entity from whom the entity has leased office space. + References No definition available. + Details
Name: | ovas_NumberOfPrincipalStockholdersFromWhomEntityHasLeasedOfficeSpace
Namespace Prefix: | ovas_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_ChiefExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |