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Organization and basis of presentation (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013
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Organization and basis of presentation |
Cash resources and investments sufficient to fund current operating plan | $ 54.3

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- Definition Represents the amount of cash resources sufficient to allow the entity to fund its current operating plan and continue as a going concern. + References No definition available. + Details
Name: | ovas_CashResourcesSufficientToFundCurrentOperatingPlan
Namespace Prefix: | ovas_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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