XML 66 R51.htm IDEA: XBRL DOCUMENT
v3.3.1.900

STOCKHOLDERS' EQUITY - WARRANTS (Details) - USD ($) |  | 1 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2015
Warrants |  |  |
Exercise Price (in dollars per share) | $ 3.75 |  |
Class of Warrant or Right, Outstanding |  |  | 537,893
Number of warrants exercised (in shares) | 235,000 |  |
Proceeds from Warrant Exercises | $ 881,000 |  |
CIRM |  |  |
Warrants |  |  |
Number of warrants net exercised |  | 461,382 |
Issuance of common stock upon net exercise of warrants (in shares) |  | 168,039 |
CIRM | Warrants issued in August 2011 |  |  |
Warrants |  |  |
Exercise Price (in dollars per share) |  |  | $ 3.98
Class of Warrant or Right, Outstanding |  |  | 537,893

X
- Definition Number Of Warrants Exercised. + References No definition available. + Details
Name: | gern_NumberOfWarrantsExercised
Namespace Prefix: | gern_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of warrants net exercised. + References No definition available. + Details
Name: | gern_NumberOfWarrantsNetExercised
Namespace Prefix: | gern_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares issued during the period related to the net exercise of warrants. + References No definition available. + Details
Name: | gern_StockIssuedDuringPeriodSharesNetExerciseOfWarrants
Namespace Prefix: | gern_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References No definition available. + Details
Name: | us-gaap_ProceedsFromWarrantExercises
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=gern_CaliforniaInstituteForRegenerativeMedicineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=gern_WarrantsIssuedInAugust2011Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |