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FORMER COLLABORATION AGREEMENT (Details) | Jun. 14, 2019 USD ($) | Sep. 28, 2018 | Sep. 27, 2018 | Dec. 15, 2014 item | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Former Collaborative Arrangement [Line Items] |  |  |  |  |  |
Amount due to Janssen Biotech, Inc. |  |  |  |  | $ 1,576,000 | $ 2,610,000
Former Collaboration Agreement |  |  |  |  |  |
Former Collaborative Arrangement [Line Items] |  |  |  |  |  |
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% |  |
Percentage of costs to be paid by Geron before termination of Collaboration Agreement |  |  | 50.00% |  |  |
Percentage of costs to be paid by Geron after termination of Collaboration Agreement |  | 100.00% |  |  |  |
Amount due to Janssen Biotech, Inc. |  |  |  |  | $ 1,576,000 |
Clinical Supply Agreement |  |  |  |  |  |
Former Collaborative Arrangement [Line Items] |  |  |  |  |  |
Expected payment for drug product upon shipment | $ 7,500,000 |  |  |  |  |
Clinical Supply Agreement | Maximum |  |  |  |  |  |
Former Collaborative Arrangement [Line Items] |  |  |  |  |  |
Expected payment for drug substance and raw materials upon testing and confirmation | $ 6,700,000 |  |  |  |  |

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