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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 |  |
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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 |  |  | $ 5,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt |  |  |  |  |  |  |  |  |  |  |
Period of maturity |  |  | 2014-08 |  |  |  |  |  |  |  |  |  |  |
Facility square-feet |  |  |  |  | 21,000 stem_AreaOfFacility / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ManufacturingFacilityMember | 3,000 stem_AreaOfFacility / us-gaap_PropertyPlantAndEquipmentByTypeAxis = stem_CellProcessingFacilityMember |  |  |  |  |  |  |  |
Proceeds from sale of property, plant and equipment | 149,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |  | 148,713 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |  |  |  |  |  |  |  |  |  |  |
Term of lease |  |  |  |  |  |  | 10 years |  |  | 3 years |  | 11 years 6 months |  |
Rent over term of lease |  |  |  |  |  |  | 3,497,000 us-gaap_LeaseAndRentalExpense / us-gaap_LeaseArrangementTypeAxis = stem_PrologisLpMember |  |  |  |  | 17,869,000 us-gaap_LeaseAndRentalExpense / us-gaap_LeaseArrangementTypeAxis = stem_BmrGatewayBoulevardLlcMember |  |
Deferred rent under sublease agreement | 98,791 us-gaap_DeferredRentCreditCurrent |  | 98,791 us-gaap_DeferredRentCreditCurrent | 85,925 us-gaap_DeferredRentCreditCurrent |  |  |  | 391,000 us-gaap_DeferredRentCreditCurrent / us-gaap_LeaseArrangementTypeAxis = stem_PrologisLpMember | 391,000 us-gaap_DeferredRentCreditCurrent / us-gaap_LeaseArrangementTypeAxis = stem_PrologisLpMember |  |  |  | 1,419,000 us-gaap_DeferredRentCreditCurrent / us-gaap_LeaseArrangementTypeAxis = stem_BmrGatewayBoulevardLlcMember | 1,429,000 us-gaap_DeferredRentCreditCurrent / us-gaap_LeaseArrangementTypeAxis = stem_BmrGatewayBoulevardLlcMember
Rental payments under the existing lease |  |  |  |  |  |  |  |  |  | £ 53,000 us-gaap_PaymentsForRent / us-gaap_LeaseArrangementTypeAxis = stem_StemCellSciencesUkMember |  |  |  |
Lease termination date |  |  |  |  |  |  |  |  |  |  | Oct. 31, 2014 |  |  |
Number of patients violate claims of Neuralstem's activities |  | 4 stem_NumberOfPatientsViolateClaims |  |  |  |  |  |  |  |  |  |  |  |

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