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SUBSEQUENT EVENT (Details) $ in Millions	Jan. 30, 2019 USD ($)
Subsequent Event | Parexel | Master Services Agreement First Work Order
Subsequent Event [Line Items]
Service fees and pass-through expenses	$ 33

X

- Definition

Estimated service fees and pass-through expenses to be paid to counterparty under work order.

+ References

No definition available.

+ Details

Name:	gern_EstimatedServiceFeesAndPassThroughExpenses
Namespace Prefix:	gern_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=gern_ParexelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=gern_MasterServicesAgreementFirstWorkOrderMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: