XML 82 R64.htm IDEA: XBRL DOCUMENT
v3.24.0.1

INCOME TAXES - CARES ACT IMPACT (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2023
C A R E S Act Impact [Abstract] |  |  |
Employee retention credit, CARES Act | $ 483,000 | $ 1,100,000 |
Employee Retention Credit, Outstanding |  |  | $ 0

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

X
- Definition Employee retention credit amount outstanding receivables. + References No definition available. + Details
Name: | gern_EmployeeRetentionCreditAmountOutstandingReceivables
Namespace Prefix: | gern_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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