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FAIR VALUE MEASUREMENTS (Details 2) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Marketable securities with unrealized losses |  |
Less Than 12 Months - Estimated Fair Value | $ 92,300 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue | $ 111,321 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Less Than 12 Months - Gross Unrealized Losses | (62)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAggregateLosses | (100)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAggregateLosses
Total - Estimated Fair Value | 92,300 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue | 111,321 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Total - Gross Unrealized Losses | (62)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLoss | (100)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLoss
Government-sponsored enterprise securities (due in less than 1 year) |  |
Marketable securities with unrealized losses |  |
Less Than 12 Months - Estimated Fair Value | 400 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_USGovernmentSponsoredEnterprisesDebtSecuritiesDueInLessThanOneYearMember | 400 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_USGovernmentSponsoredEnterprisesDebtSecuritiesDueInLessThanOneYearMember
Less Than 12 Months - Gross Unrealized Losses | (1)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_USGovernmentSponsoredEnterprisesDebtSecuritiesDueInLessThanOneYearMember | (1)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_USGovernmentSponsoredEnterprisesDebtSecuritiesDueInLessThanOneYearMember
Total - Estimated Fair Value | 400 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_USGovernmentSponsoredEnterprisesDebtSecuritiesDueInLessThanOneYearMember | 400 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_USGovernmentSponsoredEnterprisesDebtSecuritiesDueInLessThanOneYearMember
Total - Gross Unrealized Losses | (1)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_USGovernmentSponsoredEnterprisesDebtSecuritiesDueInLessThanOneYearMember | (1)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_USGovernmentSponsoredEnterprisesDebtSecuritiesDueInLessThanOneYearMember
Government-sponsored enterprise securities (due in 1 to 2 years) |  |
Marketable securities with unrealized losses |  |
Less Than 12 Months - Estimated Fair Value | 5,805 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_UsGovernmentSponsoredEnterprisesDebtSecuritiesDueInOneToTwoYearsMember | 5,549 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_UsGovernmentSponsoredEnterprisesDebtSecuritiesDueInOneToTwoYearsMember
Less Than 12 Months - Gross Unrealized Losses | (1)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_UsGovernmentSponsoredEnterprisesDebtSecuritiesDueInOneToTwoYearsMember | (7)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_UsGovernmentSponsoredEnterprisesDebtSecuritiesDueInOneToTwoYearsMember
Total - Estimated Fair Value | 5,805 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_UsGovernmentSponsoredEnterprisesDebtSecuritiesDueInOneToTwoYearsMember | 5,549 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_UsGovernmentSponsoredEnterprisesDebtSecuritiesDueInOneToTwoYearsMember
Total - Gross Unrealized Losses | (1)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_UsGovernmentSponsoredEnterprisesDebtSecuritiesDueInOneToTwoYearsMember | (7)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_UsGovernmentSponsoredEnterprisesDebtSecuritiesDueInOneToTwoYearsMember
Corporate notes (due in less than 1 year) |  |
Marketable securities with unrealized losses |  |
Less Than 12 Months - Estimated Fair Value | 80,083 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_CorporateNoteSecuritiesDueInLessThanOneYearMember | 92,989 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_CorporateNoteSecuritiesDueInLessThanOneYearMember
Less Than 12 Months - Gross Unrealized Losses | (56)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_CorporateNoteSecuritiesDueInLessThanOneYearMember | (63)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_CorporateNoteSecuritiesDueInLessThanOneYearMember
Total - Estimated Fair Value | 80,083 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_CorporateNoteSecuritiesDueInLessThanOneYearMember | 92,989 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_CorporateNoteSecuritiesDueInLessThanOneYearMember
Total - Gross Unrealized Losses | (56)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_CorporateNoteSecuritiesDueInLessThanOneYearMember | (63)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_CorporateNoteSecuritiesDueInLessThanOneYearMember
Corporate notes (due in 1 to 2 years) |  |
Marketable securities with unrealized losses |  |
Less Than 12 Months - Estimated Fair Value | 6,012 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_CorporateNoteSecuritiesDueInOneToTwoYearsMember | 12,383 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_CorporateNoteSecuritiesDueInOneToTwoYearsMember
Less Than 12 Months - Gross Unrealized Losses | (4)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_CorporateNoteSecuritiesDueInOneToTwoYearsMember | (29)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_CorporateNoteSecuritiesDueInOneToTwoYearsMember
Total - Estimated Fair Value | 6,012 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_CorporateNoteSecuritiesDueInOneToTwoYearsMember | 12,383 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_CorporateNoteSecuritiesDueInOneToTwoYearsMember
Total - Gross Unrealized Losses | $ (4)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_CorporateNoteSecuritiesDueInOneToTwoYearsMember | $ (29)gern_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = gern_CorporateNoteSecuritiesDueInOneToTwoYearsMember

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- Definition Amount of gross unrealized loss on securities classified as available-for-sale securities that have been in a loss position as of the reporting date. + References No definition available. + Details
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- Definition Amount of gross unrealized loss on securities classified as available-for-sale securities that have been in a loss position for less than twelve months as of the reporting date. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are 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 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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