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COLLABORATION AGREEMENT (Details)	Dec. 15, 2014 USD ($) item	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
COLLABORATION AGREEMENT
Accrued collaboration charges		$ 1,907,000	$ 3,367,000
Initial Period | Janssen Biotech | Collaboration Agreement
COLLABORATION AGREEMENT
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%
Accrued collaboration charges		$ 1,907,000
Notification period	24 months
U.S. Opt-In Rights exercised | Janssen Biotech | Collaboration Agreement
COLLABORATION AGREEMENT
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 | Collaboration Agreement
COLLABORATION AGREEMENT
Continuation Election milestone payment	$ 65,000,000
Full U.S. Rights fee	70,000,000
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
Collaborative Arrangement IP Exclusively Licensed | Janssen Biotech | Collaboration Agreement
COLLABORATION AGREEMENT
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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No definition available.

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The amount of consideration that Geron will receive upon Janssen providing a positive Continuation Election notice.

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- Definition

Represents the aggregate maximum consideration that Geron could receive from attaining certain development and regulatory milestone events under the collaboration agreement.

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Represents the consideration that Geron will receive from Janssen upon Geron's decision to opt-out of further development cost sharing after Janssen's positive Continuation Election notice.

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- Definition

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

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

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No definition available.

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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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- Definition

Represents the number of agreed upon studies.

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No definition available.

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- Definition

Represents the aggregate maximum consideration that Geron could receive from attaining certain sales milestone events under the collaboration agreement.

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No definition available.

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- Definition

Represents the percentage of sales effort that Geron can provide in lieu of funding the same percentage of promotion costs upon regulatory approval and commercial launch of imetelstat in the U.S.

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

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- Definition

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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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.

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