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Commitments and Contingencies - Additional Information (Detail)
1 Months Ended 6 Months Ended 1 Months Ended 1 Months Ended
Jul. 31, 2006
Claim
Jun. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
Mar. 31, 2013
Prologis, L.P [Member]
USD ($)
Jun. 30, 2014
Prologis, L.P [Member]
USD ($)
Dec. 31, 2013
Prologis, L.P [Member]
USD ($)
Oct. 31, 2013
Stem Cell Sciences (U.K.) Ltd [Member]
GBP (£)
Dec. 31, 2010
BMR-Gateway Boulevard LLC [Member]
USD ($)
Jun. 30, 2014
BMR-Gateway Boulevard LLC [Member]
USD ($)
Dec. 31, 2013
BMR-Gateway Boulevard LLC [Member]
USD ($)
Commitment And Contingencies [Line Items]                    
Proceeds from the issuance of industrial revenue bonds   $ 5,000,000                
Interest rate for remaining bond series   9.50%                
Outstanding principal   18,000 125,000              
Period of maturity   2014-08                
Term of lease       10 years     3 years 11 years 6 months    
Rent over term of lease       3,497,000       17,869,000    
Deferred rent under sublease agreement   60,097 34,366   392,000 391,000     1,440,000 1,434,000
Rental payments under the existing lease             £ 53,000      
Number of patients violate claims of Neuralstem's activities 4