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CONSOLIDATED STATEMENTS OF CASH FLOWS DATA (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Supplemental Operating Activities: |  |  |
Issuance of common stock for services rendered to date or to be received in future periods |  |  | $ 69us-gaap_StockIssuedDuringPeriodValueIssuedForServices
Issuance of common stock for 401(k) matching contributions | 313gern_StockIssuedDuringPeriodValueEmployeeBenefitPlanAndShareBasedCompensation | 839gern_StockIssuedDuringPeriodValueEmployeeBenefitPlanAndShareBasedCompensation | 1,361gern_StockIssuedDuringPeriodValueEmployeeBenefitPlanAndShareBasedCompensation
Reclassification between deposits and other current assets | 190gern_ReclassificationOfDepositsToOtherCurrentAssets | 219gern_ReclassificationOfDepositsToOtherCurrentAssets | 526gern_ReclassificationOfDepositsToOtherCurrentAssets
Supplemental Investing Activities: |  |  |
Net unrealized loss on marketable securities | $ (70)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss | $ (54)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss | $ (38)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss

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- Definition Represents the amount of deposits that are expected to be returned within one year and are therefore reclassified to other current assets. + References No definition available. + Details
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Namespace Prefix: | gern_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Gross fair value of stock issued during the period to employee defined contribution plan and as a result of payment of employee year end bonuses in equity. + References No definition available. + Details
Name: | gern_StockIssuedDuringPeriodValueEmployeeBenefitPlanAndShareBasedCompensation
Namespace Prefix: | gern_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AdditionalCashFlowElementsOperatingActivitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This item represents the pretax change in net unrealized holding gain (loss) on available-for-sale securities that has been included in accumulated other comprehensive income, a separate component of shareholders' equity, during the period. + 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 (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Value of stock issued in lieu of cash for services contributed to the entity. Value of the stock issued includes, but is not limited to, services contributed by vendors and founders. + References No definition available. + Details
Name: | us-gaap_StockIssuedDuringPeriodValueIssuedForServices
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration