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v2.4.1.9

Cash, Cash Equivalents and Short-term Investments (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Cash, cash equivalents and marketable securities |  |  |  |
Cash and money market funds, Amortized Cost | $ 6,414,000 ovas_CashAndMoneyMarketFundsAmortizedCost | $ 18,078,000 ovas_CashAndMoneyMarketFundsAmortizedCost |  |
Cash and money market funds, Fair Value | 6,414,000 ovas_CashAndMoneyMarketFundsFairValue | 18,078,000 ovas_CashAndMoneyMarketFundsFairValue |  |
Amortized Cost | 60,257,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost | 44,417,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost |  |
Gross Unrealized Gains | 2,000 ovas_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments | 13,000 ovas_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments |  |
Gross Unrealized Losses | (28,000)ovas_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments | (3,000)ovas_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments |  |
Fair Value | 60,231,000 us-gaap_AvailableForSaleSecurities | 44,427,000 us-gaap_AvailableForSaleSecurities |  |
Amortized cost of cash and cash equivalents | 6,414,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 18,078,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 14,776,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 4,541,000 us-gaap_CashAndCashEquivalentsAtCarryingValue
Fair value of cash and cash equivalents | 6,414,000 us-gaap_CashAndCashEquivalentsFairValueDisclosure | 18,078,000 us-gaap_CashAndCashEquivalentsFairValueDisclosure |  |
Amortized cost of cash and cash equivalents and marketable securities | 60,257,000 ovas_CashCashEquivalentsAndMarketableSecuritiesAmortizedCost | 44,417,000 ovas_CashCashEquivalentsAndMarketableSecuritiesAmortizedCost |  |
Fair value of cash and cash equivalents and marketable securities | 60,231,000 ovas_CashCashEquivalentsAndMarketableSecuritiesFairValue | 44,427,000 ovas_CashCashEquivalentsAndMarketableSecuritiesFairValue |  |
Number of debt securities that had been in an unrealized loss position for less than 12 months | 32 ovas_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsNumberOfSecurities | 8 ovas_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsNumberOfSecurities |  |
Number of debt securities that had been in an unrealized loss position for 12 months or longer | 0 ovas_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerNumberOfSecurities | 0 ovas_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerNumberOfSecurities |  |
Fair value of debt securities that had been in an unrealized loss position for less than 12 months | 44,200,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue | 9,500,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue |  |
Corporate debt securities due in one year or less |  |  |  |
Cash, cash equivalents and marketable securities |  |  |  |
Amortized Cost | 53,843,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = ovas_CorporateDebtSecuritiesDueInOneYearOrLessMember | 22,631,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = ovas_CorporateDebtSecuritiesDueInOneYearOrLessMember |  |
Gross Unrealized Gains | 2,000 ovas_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = ovas_CorporateDebtSecuritiesDueInOneYearOrLessMember | 11,000 ovas_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = ovas_CorporateDebtSecuritiesDueInOneYearOrLessMember |  |
Gross Unrealized Losses | (28,000)ovas_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = ovas_CorporateDebtSecuritiesDueInOneYearOrLessMember | (2,000)ovas_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = ovas_CorporateDebtSecuritiesDueInOneYearOrLessMember |  |
Fair Value | 53,817,000 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = ovas_CorporateDebtSecuritiesDueInOneYearOrLessMember | 22,640,000 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = ovas_CorporateDebtSecuritiesDueInOneYearOrLessMember |  |
Corporate debt securities due in two years or less |  |  |  |
Cash, cash equivalents and marketable securities |  |  |  |
Amortized Cost |  | 3,708,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = ovas_CorporateDebtSecuritiesDueInTwoYearsOrLessMember |  |
Gross Unrealized Gains |  | 2,000 ovas_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = ovas_CorporateDebtSecuritiesDueInTwoYearsOrLessMember |  |
Gross Unrealized Losses |  | (1,000)ovas_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = ovas_CorporateDebtSecuritiesDueInTwoYearsOrLessMember |  |
Fair Value |  | 3,709,000 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = ovas_CorporateDebtSecuritiesDueInTwoYearsOrLessMember |  |
Short-term investments Member |  |  |  |
Cash, cash equivalents and marketable securities |  |  |  |
Amortized Cost | 53,843,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | 26,339,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |  |
Gross Unrealized Gains | 2,000 ovas_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | 13,000 ovas_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |  |
Gross Unrealized Losses | (28,000)ovas_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | (3,000)ovas_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |  |
Fair Value | 53,817,000 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | 26,349,000 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |  |
Realized gains | 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Realized losses | 0 us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | 0 us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | 0 us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Other-than-temporary impairments recognized | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Financial institution debt securities and other corporate debt securities located in foreign countries |  |  |  |
Cash, cash equivalents and marketable securities |  |  |  |
Amortized Cost | $ 7,500,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_ForeignCorporateDebtSecuritiesMember | $ 11,700,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_ForeignCorporateDebtSecuritiesMember |  |

X
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- Definition This item represents the number of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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