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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. + Details
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- Definition Represents the amount of gain (loss) recognized on assets surrendered. + References No definition available. + Details
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- Definition Percentage of investee's stock owned immediately after all stock transactions. + References No definition available. + Details
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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 + Details
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