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Commitments and Contingencies - Additional Information (Detail)	1 Months Ended		3 Months Ended				1 Months Ended			1 Months Ended	3 Months Ended	1 Months Ended
	Mar. 31, 2015 USD ($)	Jul. 31, 2006 Claim	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2015 Pilot Manufacturing Facility [Member] sqft	Mar. 31, 2015 Cell Processing Facility [Member] sqft	Mar. 31, 2013 Prologis, L.P [Member] USD ($)	Mar. 31, 2015 Prologis, L.P [Member] USD ($)	Dec. 31, 2014 Prologis, L.P [Member] USD ($)	Oct. 31, 2013 Stem Cell Sciences (U.K.) Ltd [Member] GBP (£)	Mar. 31, 2015 Stem Cell Sciences (U.K.) Ltd [Member]	Dec. 31, 2010 BMR-Gateway Boulevard LLC [Member] USD ($)	Mar. 31, 2015 BMR-Gateway Boulevard LLC [Member] USD ($)	Dec. 31, 2014 BMR-Gateway Boulevard LLC [Member] USD ($)
Commitment And Contingencies [Line Items]
Proceeds from the issuance of industrial revenue bonds			$ 5,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
Period of maturity			2014-08
Facility square-feet					21,000stem_AreaOfFacility / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ManufacturingFacilityMember	3,000stem_AreaOfFacility / us-gaap_PropertyPlantAndEquipmentByTypeAxis = stem_CellProcessingFacilityMember
Proceeds from sale of property, plant and equipment	149,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment		148,713us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Term of lease							10 years			3 years		11 years 6 months
Rent over term of lease							3,497,000us-gaap_LeaseAndRentalExpense / us-gaap_LeaseArrangementTypeAxis = stem_PrologisLpMember					17,869,000us-gaap_LeaseAndRentalExpense / us-gaap_LeaseArrangementTypeAxis = stem_BmrGatewayBoulevardLlcMember
Deferred rent under sublease agreement	98,791us-gaap_DeferredRentCreditCurrent		98,791us-gaap_DeferredRentCreditCurrent	85,925us-gaap_DeferredRentCreditCurrent				391,000us-gaap_DeferredRentCreditCurrent / us-gaap_LeaseArrangementTypeAxis = stem_PrologisLpMember	391,000us-gaap_DeferredRentCreditCurrent / us-gaap_LeaseArrangementTypeAxis = stem_PrologisLpMember				1,419,000us-gaap_DeferredRentCreditCurrent / us-gaap_LeaseArrangementTypeAxis = stem_BmrGatewayBoulevardLlcMember	1,429,000us-gaap_DeferredRentCreditCurrent / us-gaap_LeaseArrangementTypeAxis = stem_BmrGatewayBoulevardLlcMember
Rental payments under the existing lease										£ 53,000us-gaap_PaymentsForRent / us-gaap_LeaseArrangementTypeAxis = stem_StemCellSciencesUkMember
Lease termination date											Oct. 31, 2014
Number of patients violate claims of Neuralstem's activities		4stem_NumberOfPatientsViolateClaims

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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