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Commitments and Contingencies - Additional Information (Detail)
1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended
Jul. 31, 2006
Claim
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2014
Pilot Manufacturing Facility [Member]
sqft
Dec. 31, 2014
Cell Processing Facility [Member]
sqft
Dec. 31, 2010
BMR-Gateway Boulevard LLC [Member]
USD ($)
Dec. 31, 2014
BMR-Gateway Boulevard LLC [Member]
USD ($)
Dec. 31, 2013
BMR-Gateway Boulevard LLC [Member]
USD ($)
Mar. 31, 2013
Prologis, L.P [Member]
USD ($)
Dec. 31, 2014
Prologis, L.P [Member]
USD ($)
Dec. 31, 2013
Prologis, L.P [Member]
USD ($)
Oct. 31, 2013
Stem Cell Sciences (U.K.) Ltd [Member]
GBP (£)
Dec. 31, 2014
Stem Cell Sciences (U.K.) Ltd [Member]
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
               
Term of lease           11 years 6 months     10 years     3 years  
Rent over term of lease           17,869,000us-gaap_LeaseAndRentalExpense
/ us-gaap_LeaseArrangementTypeAxis
= stem_BmrGatewayBoulevardLlcMember
    3,497,000us-gaap_LeaseAndRentalExpense
/ us-gaap_LeaseArrangementTypeAxis
= stem_PrologisLpMember
       
Deferred rent under sublease agreement   85,925us-gaap_DeferredRentCreditCurrent 34,366us-gaap_DeferredRentCreditCurrent       1,429,000us-gaap_DeferredRentCreditCurrent
/ us-gaap_LeaseArrangementTypeAxis
= stem_BmrGatewayBoulevardLlcMember
1,434,000us-gaap_DeferredRentCreditCurrent
/ us-gaap_LeaseArrangementTypeAxis
= stem_BmrGatewayBoulevardLlcMember
  391,000us-gaap_DeferredRentCreditCurrent
/ us-gaap_LeaseArrangementTypeAxis
= stem_PrologisLpMember
391,000us-gaap_DeferredRentCreditCurrent
/ us-gaap_LeaseArrangementTypeAxis
= stem_PrologisLpMember
   
Rental payments under the existing lease                       £ 53,000us-gaap_PaymentsForRent
/ us-gaap_LeaseArrangementTypeAxis
= stem_StemCellSciencesUkMember
 
Lease termination date   Jun. 30, 2013                     Oct. 31, 2014
Number of patients violate claims of Neuralstem's activities 4stem_NumberOfPatientsViolateClaims