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LICENSE AGREEMENTS (Details) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 15, 2016 USD ($) item | Dec. 15, 2014 USD ($) item | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Accrued collaboration charges |  |  |  |  | $ 1,702,000 | $ 3,367,000 |
Collaboration revenue |  |  |  |  |  |  | $ 35,000,000
License fees and royalties |  |  |  |  | 1,065,000 | $ 6,162,000 | $ 1,371,000
Janssen Biotech | License agreements |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
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 |  |  |  |  | $ 1,702,000 |  |
Notification period |  | 24 months |  |  |  |  |
Maximum period Geron is obligated to procure supply for manufacturing imetelstat under collaboration agreement |  | 9 months |  |  |  |  |
Collaboration revenue |  |  |  | $ 35,000,000 |  |  |
Janssen Biotech | License agreements | U.S. Opt-In Rights exercised |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
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 |  | midteens |  |  |  |  |
Tiered royalties percentage, high end of the range |  | low twenties |  |  |  |  |
U.S. selling effort percentage |  | 20.00% |  |  |  |  |
Janssen Biotech | License agreements | U.S. Opt-In Rights not exercised |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
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 |  |  |  |  |
Full U.S. Rights fee |  | $ 70,000,000 |  |  |  |  |
Tiered royalties percentage, low end of the range |  | doubledigit |  |  |  |  |
Tiered royalties percentage, high end of the range |  | midteens |  |  |  |  |
Janssen Biotech | License Arrangement IP Exclusively Licensed |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Percentage of costs to be paid by Geron |  | 50.00% |  |  |  |  |
Percentage of costs to be paid by Janssen |  | 50.00% |  |  |  |  |
Janssen Pharmaceuticals Inc | License agreements |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Least number of products under License Agreement | item | 1 |  |  |  |  |  |
Upfront payment received under license agreement | $ 5,000,000 |  |  |  |  |  |
Aggregate maximum total payments for development and regulatory milestones under license agreement | $ 75,000,000 |  |  |  |  |  |
Tiered royalties percentage range | low single digit |  |  |  |  |  |
License fees and royalties |  |  | $ 5,000,000 |  |  |  |
Janssen Pharmaceuticals Inc | License Arrangement IP Exclusively Licensed |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Percentage of costs to be paid by Geron | 50.00% |  |  |  |  |  |
Percentage of costs to be paid by Janssen Pharmaceuticals | 50.00% |  |  |  |  |  |

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