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LICENSE AGREEMENTS (Details) - USD ($) | Sep. 29, 2018 | Dec. 31, 2020 | Dec. 31, 2019
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Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |
Percentage of costs to be paid by Geron after termination of Collaboration Agreement | 100.00% |  |
Clinical Supply Agreement |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |
Amount due to Janssen Biotech, Inc. |  | $ 0 | $ 14,269,000

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- Definition Represents the percentage of costs that the company must pay after the termination of the Collaboration Agreement. + References No definition available. + Details
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Balance Type: | na
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- Definition Carrying amount as of the balance sheet date of obligations due to counterparty. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer). + References No definition available. + Details
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Namespace Prefix: | gern_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition 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. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |