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DIVESTITURE OF STEM CELL ASSETS (Details) (USD $)	0 Months Ended
	Oct. 01, 2013	Oct. 01, 2013
DIVESTITURE OF STEM CELL ASSETS
Gain or loss recognized on assets surrendered	$ 0gern_GainLossOnAssetsSurrendered
Carrying value of stem cell assets	0gern_CarryingValueOfStemCellAssets	0gern_CarryingValueOfStemCellAssets
Series A common stock
DIVESTITURE OF STEM CELL ASSETS
Carrying value of common stock	$ 0gern_CommonStockCarryingValueAssigned / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	$ 0gern_CommonStockCarryingValueAssigned / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Contribution Agreement | Asterias
DIVESTITURE OF STEM CELL ASSETS
Shares issued	6,537,779us-gaap_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationSharesIssued1 / dei_LegalEntityAxis = gern_AsteriasMember / us-gaap_NoncashOrPartNoncashDivestituresByUniqueNameAxis = gern_NoncashOrPartNoncashAgreementToDivestOfHumanEmbryonicStemCellAssetsAndAutologousCellularImmunotherapyProgramMember
Percentage ownership in Asterias	21.40%gern_InvesteeCumulativePercentageOwnershipAfterAllTransactions / dei_LegalEntityAxis = gern_AsteriasMember / us-gaap_NoncashOrPartNoncashDivestituresByUniqueNameAxis = gern_NoncashOrPartNoncashAgreementToDivestOfHumanEmbryonicStemCellAssetsAndAutologousCellularImmunotherapyProgramMember

X

- Definition

Represents the amount of carrying value of stem cell assets as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Represents the carrying value assigned to Asterias Series A common stock received in stem cell divestiture.

+ References

No definition available.

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- Definition

Represents the amount of gain (loss) recognized on assets surrendered.

+ References

No definition available.

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- Definition

Percentage of investee's stock owned immediately after all stock transactions.

+ References

No definition available.

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- Definition

The number of shares issued as [noncash or part noncash] consideration for a business or asset acquired. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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