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Collaboration with Intrexon and OvaXon Joint Venture (Details 2) (USD $) | 0 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 18, 2013 | Dec. 31, 2014 | Jan. 31, 2015 | Dec. 31, 2013
OvaXon joint venture |  |  |  |
Equity method investment |  |  | $ 800,000 us-gaap_EquityMethodInvestments | $ 1,500,000 us-gaap_EquityMethodInvestments
OvaXon |  |  |  |
OvaXon joint venture |  |  |  |
Amount contributed | 1,500,000 us-gaap_EquityMethodInvestmentAggregateCost / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember |  |  |
Equity interest (as a percent) | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember |  |  |
Percentage of ownership control with disputes resolved through arbitration | 50.00%ovas_OwnershipControlPercentageWithDisputesResolvedThroughArbitration / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember |  |  |
Voting rights (as a percent) |  | 50.00%us-gaap_VariableInterestEntityOwnershipPercentage / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember |  |
Equity method investment |  |  | 800,000 us-gaap_EquityMethodInvestments / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember | 1,500,000 us-gaap_EquityMethodInvestments / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
OvaXon | Intrexon |  |  |  |
OvaXon joint venture |  |  |  |
Amount contributed | $ 1,500,000 us-gaap_EquityMethodInvestmentAggregateCost / us-gaap_CounterpartyNameAxis = ovas_IntrexonIncMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember |  |  |
Equity interest (as a percent) | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_CounterpartyNameAxis = ovas_IntrexonIncMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember |  |  |
Percentage of ownership control with disputes resolved through arbitration | 50.00%ovas_OwnershipControlPercentageWithDisputesResolvedThroughArbitration / us-gaap_CounterpartyNameAxis = ovas_IntrexonIncMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember |  |  |

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- Definition This element represents the aggregate cost of investments accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 12 -Article 5 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28200181&loc=SL6759159-111685 + Details
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