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STOCKHOLDERS' EQUITY (Details) (USD $) | 0 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | ---
Feb. 04, 2014 | Dec. 31, 2014 | Dec. 31, 2014
Warrants |  |  |
Class of Warrant or Right, Outstanding |  | 1,007,893us-gaap_ClassOfWarrantOrRightOutstanding | 1,007,893us-gaap_ClassOfWarrantOrRightOutstanding
Underwritten Public Offering |  |  |
Underwritten public offering (in shares) | 25,875,000us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |
Public offering price (in dollars per share) | $ 4.00gern_EquityIssuancePerShareAmountAtPublicOffering |  |
Net cash proceeds from public offering after deducting the underwriting discount and offering expenses | $ 96,805,000us-gaap_StockIssuedDuringPeriodValueNewIssues | $ 96,805,000us-gaap_StockIssuedDuringPeriodValueNewIssues |
Warrants issued in August 2011 |  |  |
Warrants |  |  |
Exercise Price (in dollars per share) |  | $ 3.98us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = gern_WarrantsIssuedInAugust2011Member | 3.98us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = gern_WarrantsIssuedInAugust2011Member
Class of Warrant or Right, Outstanding |  | 537,893us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = gern_WarrantsIssuedInAugust2011Member | 537,893us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = gern_WarrantsIssuedInAugust2011Member
Warrants issued in April 2005 |  |  |
Warrants |  |  |
Exercise Price (in dollars per share) |  | $ 3.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = gern_WarrantsIssuedInApril2005Member | 3.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = gern_WarrantsIssuedInApril2005Member
Class of Warrant or Right, Outstanding |  | 470,000us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = gern_WarrantsIssuedInApril2005Member | 470,000us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = gern_WarrantsIssuedInApril2005Member
CIRM | Warrants issued in November 2011 |  |  |
Warrants |  |  |
Number of warrants net exercised |  |  | 461,382gern_NumberOfWarrantsNetExcercised / us-gaap_ClassOfWarrantOrRightAxis = gern_WarrantsIssuedInNovember2011Member / dei_LegalEntityAxis = gern_CaliforniaInstituteForRegenerativeMedicineMember
Issuance of common stock upon net exercise of warrants (in shares) |  |  | 168,039gern_StockIssuedDuringPeriodSharesNetExerciseOfWarrants / us-gaap_ClassOfWarrantOrRightAxis = gern_WarrantsIssuedInNovember2011Member / dei_LegalEntityAxis = gern_CaliforniaInstituteForRegenerativeMedicineMember

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