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STOCKHOLDERS' EQUITY - SALES AGREEMENT (Details)	Aug. 28, 2015 USD ($)
STOCKHOLDERS' EQUITY
Aggregate offering price of common stock	$ 50,000,000
Maximum commission rate (as a percent)	3.00%

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 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

- References

No definition available.

+ Details

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