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Commitments and Contingencies (Details) (USD $) | 12 Months Ended | 0 Months Ended | 1 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | May 01, 2012 | Jun. 30, 2014 | May 31, 2012
Future minimum lease payments |  |  |  |  |  |
Rent expense | $ 600,000 us-gaap_LeaseAndRentalExpense | $ 400,000 us-gaap_LeaseAndRentalExpense | $ 200,000 us-gaap_LeaseAndRentalExpense |  |  |
Lease agreement |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |
Period of lease |  |  |  | 60 months |  |
Area of lease (in square feet) | 6,000 us-gaap_NetRentableArea / us-gaap_TypeOfArrangementAxis = us-gaap_LeaseAgreementsMember |  |  |  |  |
Base annual rent per month | 22,000 ovas_LeaseBaseAnnualRentPerMonth / us-gaap_TypeOfArrangementAxis = us-gaap_LeaseAgreementsMember |  |  |  |  |
Annual increase in base annual rent (as a percent) | 3.00%ovas_PercentageOfAnnualIncreaseInLeaseBaseAnnualRent / us-gaap_TypeOfArrangementAxis = us-gaap_LeaseAgreementsMember |  |  |  |  |
Future minimum lease payments |  |  |  |  |  |
2015 | 646,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / us-gaap_TypeOfArrangementAxis = us-gaap_LeaseAgreementsMember |  |  |  |  |
2016 | 292,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / us-gaap_TypeOfArrangementAxis = us-gaap_LeaseAgreementsMember |  |  |  |  |
2017 | 173,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / us-gaap_TypeOfArrangementAxis = us-gaap_LeaseAgreementsMember |  |  |  |  |
Total | 1,111,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_TypeOfArrangementAxis = us-gaap_LeaseAgreementsMember |  |  |  |  |
Lease Agreements Two |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |
Period of lease |  |  |  |  | 17 months 15 days |
Area of lease (in square feet) | 5,800 us-gaap_NetRentableArea / us-gaap_TypeOfArrangementAxis = ovas_LeaseAgreementsTwoMember |  |  |  |  |
Base annual rent per month | 27,272 ovas_LeaseBaseAnnualRentPerMonth / us-gaap_TypeOfArrangementAxis = ovas_LeaseAgreementsTwoMember |  |  |  |  |
Annual increase in sublease base annual rent (as a percent) | 1.80%ovas_PercentageOfAnnualIncreaseInSubleaseBaseAnnualRent / us-gaap_TypeOfArrangementAxis = ovas_LeaseAgreementsTwoMember |  |  |  |  |
Sublease agreement |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |
Period of lease |  |  |  |  |  | 24 months
Area of lease (in square feet) | 1,900 us-gaap_NetRentableArea / us-gaap_TypeOfArrangementAxis = ovas_SubleaseAgreementMember |  |  |  |  |
Sublease base annual rent per month | $ 4,000 ovas_SubleaseBaseAnnualRentPerMonth / us-gaap_TypeOfArrangementAxis = ovas_SubleaseAgreementMember |  |  |  |  |
Annual increase in sublease base annual rent (as a percent) | 3.00%ovas_PercentageOfAnnualIncreaseInSubleaseBaseAnnualRent / us-gaap_TypeOfArrangementAxis = ovas_SubleaseAgreementMember |  |  |  |  |

X
- Definition Represents the base annual rent the lessee is obligated to pay on a lease per month. + References No definition available. + Details
Name: | ovas_LeaseBaseAnnualRentPerMonth
Namespace Prefix: | ovas_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the percentage of annual increase in the base annual rent the lessee is obligated to pay on an operating lease. + References No definition available. + Details
Name: | ovas_PercentageOfAnnualIncreaseInLeaseBaseAnnualRent
Namespace Prefix: | ovas_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the percentage of annual increase in the sublease base annual rent the lessee is obligated to pay on an operating lease. + References No definition available. + Details
Name: | ovas_PercentageOfAnnualIncreaseInSubleaseBaseAnnualRent
Namespace Prefix: | ovas_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the sublease base annual rent the lessee is obligated to pay on the lease per month. + References No definition available. + Details
Name: | ovas_SubleaseBaseAnnualRentPerMonth
Namespace Prefix: | ovas_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_LesseeLeasingArrangementsOperatingLeasesTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net rentable area for properties owned. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Details
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- Definition Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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X
- Definition Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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X
- Definition Amount of required minimum rental payments maturing in the second fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |