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LICENSE AGREEMENTS (Details)			3 Months Ended		9 Months Ended
	Sep. 15, 2016 USD ($) item	Dec. 15, 2014 USD ($) item	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
LICENSE AGREEMENTS
License fee revenue			$ 5,108,000	$ 363,000	$ 6,068,000	$ 1,151,000
Collaboration revenue				$ 35,000,000		$ 35,000,000
Accrued collaboration charges			3,398,000		$ 3,398,000		$ 2,328,000
Janssen Pharmaceuticals | License agreements
LICENSE AGREEMENTS
Upfront Payment	$ 5,000,000
License fee revenue			$ 5,000,000
Least number of products under License Agreement | item	1
Percentage of costs to be paid by Geron	50.00%
Percentage of costs to be paid by Janssen Pharmaceuticals	50.00%
Aggregate maximum total payments for development and regulatory milestones under license agreement	$ 75,000,000
Tiered royalties percentage range	low single digit
Initial Period | Janssen Biotech | License agreements
LICENSE AGREEMENTS
Upfront payment received		$ 35,000,000
Number of agreed upon studies | item		2
Percentage of costs to be paid by Geron		50.00%
Percentage of costs to be paid by Janssen		50.00%
Notification period		24 months
U.S. Opt-In Rights exercised | Janssen Biotech | License agreements
LICENSE AGREEMENTS
Percentage of costs to be paid by Geron		20.00%
Percentage of costs to be paid by Janssen		80.00%
Continuation Election milestone payment		$ 65,000,000
Aggregate maximum total payments for development and regulatory milestones under collaboration agreement		470,000,000
Aggregate maximum total of payments for sales milestones under collaboration agreement		$ 350,000,000
Tiered royalties percentage, low end of the range		mid-teens
Tiered royalties percentage, high end of the range		low twenties
U.S. selling effort percentage		20.00%
U.S. Opt-In Rights not exercised | Janssen Biotech | License agreements
LICENSE AGREEMENTS
Continuation Election milestone payment		$ 65,000,000
Aggregate maximum total payments for development and regulatory milestones under collaboration agreement		415,000,000
Aggregate maximum total of payments for sales milestones under collaboration agreement		$ 350,000,000
Tiered royalties percentage, low end of the range		double-digit
Tiered royalties percentage, high end of the range		mid-teens
Full U.S. Rights fee		$ 70,000,000
Collaborative Arrangement IP Exclusively Licensed | Janssen Biotech | License agreements
LICENSE AGREEMENTS
Percentage of costs to be paid by Geron		50.00%
Percentage of costs to be paid by Janssen		50.00%

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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