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Commitments and Contingencies - Additional Information (Detail)	1 Months Ended	9 Months Ended		1 Months Ended			1 Months Ended			1 Months Ended
	Jul. 31, 2006 Claim	Sep. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2010 BMR-Gateway Boulevard LLC [Member] USD ($)	Sep. 30, 2014 BMR-Gateway Boulevard LLC [Member] USD ($)	Dec. 31, 2013 BMR-Gateway Boulevard LLC [Member] USD ($)	Mar. 31, 2013 Prologis, L.P [Member] USD ($)	Sep. 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 (£)
Commitment And Contingencies [Line Items]
Proceeds from the issuance of industrial revenue bonds		$ 5,000,000
Period of maturity		2014-08
Term of lease				11 years 6 months			10 years			3 years
Rent over term of lease				17,869,000			3,497,000
Deferred rent under sublease agreement		73,060	34,366		1,439,000	1,434,000		392,000	391,000
Rental payments under the existing lease										£ 53,000
Number of patients violate claims of Neuralstem's activities	4

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For a classified balance sheet, the cumulative difference as of the balance sheet date between the payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense, by the lessor or lessee, respectively, within one year of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

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-Publisher FASB

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-Topic 230

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Glossary Financing Activities

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