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COLLABORATION AND LICENSE AGREEMENT (Details)		3 Months Ended
	Dec. 15, 2014 USD ($) item	Sep. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
LICENSE AGREEMENTS
Collaboration revenue		$ 35,000,000
Accrued collaboration charges			$ 3,420,000	$ 2,328,000
License agreements | Janssen Biotech | Initial Period
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
License agreements | Janssen Biotech | U.S. Opt-In Rights exercised
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%
License agreements | Janssen Biotech | U.S. Opt-In Rights not exercised
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
License agreements | Janssen Biotech | Collaborative Arrangement IP Exclusively Licensed
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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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable to collaboration partner for which invoices have not yet been received under the respective collaboration agreement (due within one year or within the normal operating cycle if longer).

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Represents the percentage of costs that Geron must pay during certain phases of the agreement.

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- Definition

Represents the latest notification period from Janssen to Geron in the event of early termination or suspension of the Initial Phase 2 MF Study.

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Represents the low end of the range of tiered royalty percentages to be applied to worldwide net sales of imetelstat.

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Upfront payment received from Janssen upon effectiveness of Collaboration Agreement.

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Amount of revenue earned from products sold or services provided under the terms of a contract, including, but not limited to, government contracts and construction contracts, classified as other.

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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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