XML 89 R69.htm IDEA: XBRL DOCUMENT v2.4.1.9

CONSOLIDATED STATEMENTS OF CASH FLOWS DATA (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Operating Activities:
Issuance of common stock for services rendered to date or to be received in future periods			$ 69us-gaap_StockIssuedDuringPeriodValueIssuedForServices
Issuance of common stock for 401(k) matching contributions	313gern_StockIssuedDuringPeriodValueEmployeeBenefitPlanAndShareBasedCompensation	839gern_StockIssuedDuringPeriodValueEmployeeBenefitPlanAndShareBasedCompensation	1,361gern_StockIssuedDuringPeriodValueEmployeeBenefitPlanAndShareBasedCompensation
Reclassification between deposits and other current assets	190gern_ReclassificationOfDepositsToOtherCurrentAssets	219gern_ReclassificationOfDepositsToOtherCurrentAssets	526gern_ReclassificationOfDepositsToOtherCurrentAssets
Supplemental Investing Activities:
Net unrealized loss on marketable securities	$ (70)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss	$ (54)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss	$ (38)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss

X

- Definition

Represents the amount of deposits that are expected to be returned within one year and are therefore reclassified to other current assets.

+ References

No definition available.

+ Details

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

X

- Definition

Gross fair value of stock issued during the period to employee defined contribution plan and as a result of payment of employee year end bonuses in equity.

+ References

No definition available.

+ Details

Name:	gern_StockIssuedDuringPeriodValueEmployeeBenefitPlanAndShareBasedCompensation
Namespace Prefix:	gern_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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

X

- Details

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

X

- Definition

This item represents the pretax change in net unrealized holding gain (loss) on available-for-sale securities that has been included in accumulated other comprehensive income, a separate component of shareholders' equity, during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Value of stock issued in lieu of cash for services contributed to the entity. Value of the stock issued includes, but is not limited to, services contributed by vendors and founders.

+ References

No definition available.

+ Details

Name:	us-gaap_StockIssuedDuringPeriodValueIssuedForServices
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration