XML 34 R61.htm IDEA: XBRL DOCUMENT v2.4.1.9

STOCKHOLDERS' EQUITY (Details 11) (Maximum, Sales Agreement, USD $)	0 Months Ended
	Oct. 08, 2012
Maximum | Sales Agreement
Common Stock
Aggregate offering price of common stock	$ 50,000,000gern_CommonStockAggregateOfferingPrice / gern_AgreementsAxis = gern_AtTheMarketIssuanceSalesAgreementMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum commission rate (as a percent)	3.00%gern_MaximumCommissionRate / gern_AgreementsAxis = gern_AtTheMarketIssuanceSalesAgreementMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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

- Details

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