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Commitments and Contingencies - Additional Information (Detail) | 1 Months Ended | 6 Months Ended |  | 1 Months Ended |  |  | 1 Months Ended |  |
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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 |  |  |  |  |  |  |  |  |

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