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Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Accrued Expenses |  |
Compensation and related benefits | $ 2,753 us-gaap_EmployeeRelatedLiabilitiesCurrent | $ 719 us-gaap_EmployeeRelatedLiabilitiesCurrent
Development, site costs, and contract manufacturing | 2,567 ovas_DevelopmentSiteCostsAndContractManufacturing | 258 ovas_DevelopmentSiteCostsAndContractManufacturing
Legal, audit and tax services | 829 ovas_AccruedLegalAuditAndTaxServicesCurrent | 605 ovas_AccruedLegalAuditAndTaxServicesCurrent
Consulting | 793 ovas_AccruedProfessionalAndConsultantFeesCurrent | 174 ovas_AccruedProfessionalAndConsultantFeesCurrent
Other expenses | 712 us-gaap_OtherAccruedLiabilitiesCurrent | 178 us-gaap_OtherAccruedLiabilitiesCurrent
Technology access fee payable to Intrexon (present value) |  | 2,186 ovas_AccruedTechnologyAccessFeePayableCurrent
Accrued expenses | $ 7,654 us-gaap_AccruedLiabilitiesCurrent | $ 4,120 us-gaap_AccruedLiabilitiesCurrent

X
- Definition Represents the carrying value as of the balance sheet date of obligations incurred through that date and payable for the obligations related to legal, audit and tax services. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle, if longer). + References No definition available. + Details
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