XML 70 R55.htm IDEA: XBRL DOCUMENT
v3.3.1.900

STOCKHOLDERS' EQUITY - EMPLOYEE STOCK PURCHASE PLAN (Details) | 12 Months Ended
--- | ---
Dec. 31, 2015 item shares
STOCKHOLDERS' EQUITY |
Shares of common stock reserved for issuance | shares | 1,000,000
Aggregate shares issued under plan | shares | 57,635
Maximum percentage of annual salary that can be withheld | 10.00%
Maximum duration of offering period | 12 months
Number of offering periods in which an employee can participate at a time | item | 1
Number of consecutive purchase periods in an offering period | item | 2
Duration of the purchase period | 6 months
Percentage applied to common stock market value in calculating purchase price under purchase plan | 85.00%
Duration of the new offering period | 12 months

X
- Definition Represents the aggregate number of share instruments issued under a share-based compensation plan. + References No definition available. + Details
Name: | gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateSharesIssuedUnderPlan
Namespace Prefix: | gern_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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
Name: | gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardDurationOfNewOfferingPeriod
Namespace Prefix: | gern_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the duration of the purchase period under the employee stock purchase plan. + References No definition available. + Details
Name: | gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardDurationOfPurchasePeriod
Namespace Prefix: | gern_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the maximum duration of the offering period under the employee stock purchase plan. + References No definition available. + Details
Name: | gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumDurationOfOfferingPeriod
Namespace Prefix: | gern_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfOfferingPeriodsInWhichEmployeeMayParticipateAtOneTime
Namespace Prefix: | gern_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumPercentageOfAnnualSalaryThatCanBeWithheld
Namespace Prefix: | gern_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of consecutive purchase periods in an offering period in the purchase plan. + References No definition available. + Details
Name: | gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfConsecutivePurchasePeriodsInEachOfferingPeriod
Namespace Prefix: | gern_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_StockholdersEquityNoteAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration