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INCOME TAXES - CARES ACT IMPACT (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
C A R E S Act Impact [Abstract] |  |
Employee retention credit, CARES Act | $ 483,000 | $ 1,152,000

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- Definition CARES act impact. + References No definition available. + Details
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Namespace Prefix: | gern_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount as of the balance sheet date of employer taxes paid to tax authorities representing refunds based on calculated eligible credits. Also called employer tax refund receivable. + References No definition available. + Details
Name: | gern_EmployerTaxReceivable
Namespace Prefix: | gern_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration