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COMMITMENTS AND CONTINGENCIES - Severance Plan (Details) | 12 Months Ended
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Dec. 31, 2023 Plan
Severance Plan |
severance plans | 2
Period within which employee is terminated by entity without cause following a change of control | 12 months
Period within which no comparable employment is offered by the entity following a change of control | 30 days
Period within which employee resigns following a change of control due to material change in terms of employment | 12 months
Employees Above The Vice President Level |
Severance Plan |
severance plans | 1
Minimum |
Severance Plan |
Period of base salary to be considered for severance payments | 3 months
Period of base salary in connection with a non-change of control to be considered for severance payments | 42 days
Maximum |
Severance Plan |
Period of base salary to be considered for severance payments | 18 months
Period of base salary in connection with a non-change of control to be considered for severance payments | 12 months

X
- Definition Loss contingency period of current base salary to be paid under severance plan. + References No definition available. + Details
Name: | gern_LossContingencyPeriodOfCurrentBaseSalaryToBePaidUnderSeverancePlan
Namespace Prefix: | gern_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loss contingency period of current base salary to be paid under severance plan non change of control triggering event. + References No definition available. + Details
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Namespace Prefix: | gern_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of months following a change in control when an employee is terminated without cause to be classified as a triggering event for severance payments. + References No definition available. + Details
Name: | gern_LossContingencyTriggeringEventEmployeeTerminationWithoutCauseFollowingChangeOfControlPeriod
Namespace Prefix: | gern_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period following change of control within which an employee is not offered comparable employment (new or continuing) by the entity or its successor or acquired and to be considered as triggering event for severance payments. + References No definition available. + Details
Name: | gern_LossContingencyTriggeringEventPeriodFollowingChangeOfControlDuringWhichNoComparableEmploymentIsOfferedByEntity
Namespace Prefix: | gern_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period within which employee resigns following a change of control due to material change in terms of employment and to be considered as triggering event for severance payments. + References No definition available. + Details
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Namespace Prefix: | gern_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of severance plan. + References No definition available. + Details
Name: | gern_NumberOfSeverancePlan
Namespace Prefix: | gern_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Severance plan. + References No definition available. + Details
Name: | gern_SeverancePlanLineItems
Namespace Prefix: | gern_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_TitleOfIndividualAxis=gern_EmployeesAboveTheVicePresidentLevelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |