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STOCKHOLDERS' EQUITY (Details 11) (Sales Agreement, USD $)	12 Months Ended	0 Months Ended
	Dec. 31, 2013	Oct. 08, 2012 Maximum
Common Stock
Aggregate offering price of common stock		$ 50,000,000
Maximum commission rate (as a percent)		3.00%
Sales Agreement
Lock-up period	60 days

X

- Definition

Represents the aggregate offering price for which the entity may elect to issue and sell shares of its common stock under the sales agreement.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the duration of the lock-up period following the underwritten public offering.

+ References

No definition available.

+ Details

Name:	gern_LockUpPeriodFollowingPublicOffering
Namespace Prefix:	gern_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the percentage of maximum commission rate, based on gross proceeds of sale price per share of common stock sold through MLV & Co. under the sales agreement.

+ References

No definition available.

+ Details

Name:	gern_MaximumCommissionRate
Namespace Prefix:	gern_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	gern_SalesAgreementAbstract
Namespace Prefix:	gern_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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