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STOCKHOLDERS' EQUITY (Details 5) | 12 Months Ended
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Dec. 31, 2014
STOCKHOLDERS' EQUITY |
Canceled/forfeited (in shares) | (142,375)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
2014 Employee Stock Purchase Plan |
STOCKHOLDERS' EQUITY |
Shares of common stock reserved for issuance | 1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember
Shares issued under plan | 24,375us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember
Maximum percentage of annual salary that can be withheld | 10.00%gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumPercentageOfAnnualSalaryThatCanBeWithheld / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember
Maximum duration of offering period | 12 months
Number of offering periods in which an employee can participate at a time | 1gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfOfferingPeriodsInWhichEmployeeMayParticipateAtOneTime / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember
Number of consecutive purchase periods in an offering period | 2gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfConsecutivePurchasePeriodsInEachOfferingPeriod / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember
Duration of the purchase period | 6 months
Percentage applied to common stock market value in calculating purchase price under purchase plan | 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember
Duration of the new offering period | 12 months
1996 Employee Stock Purchase Plan |
STOCKHOLDERS' EQUITY |
Shares issued under plan | 968,829us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_PlanNameAxis = gern_EmployeeStockPurchasePlan1996Member
Canceled/forfeited (in shares) | 231,171us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_PlanNameAxis = gern_EmployeeStockPurchasePlan1996Member

X
- Definition Represents the duration of new offering period in a case where the fair market value of common stock on the purchase date is less than the fair market value at the beginning of the offering period. + References No definition available. + Details
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- Definition Represents the duration of the purchase period under the employee stock purchase plan. + References No definition available. + Details
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Namespace Prefix: | gern_
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- Definition Represents the maximum duration of the offering period under the employee stock purchase plan. + References No definition available. + Details
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- Definition Represents the number of offering periods in which an employee can participate at a time in the purchase plan. + References No definition available. + Details
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- Definition Represents the maximum percentage of annual salary that an employee can choose to have withheld to purchase common stock under the purchase plan. + References No definition available. + Details
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- Definition Represents the number of consecutive purchase periods in an offering period in the purchase plan. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Details
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