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Commitments and Contingencies - Additional Information (Detail)	1 Months Ended	3 Months Ended		1 Months Ended			1 Months Ended			1 Months Ended
	Jul. 31, 2006 Claim	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Mar. 31, 2013 Prologis, L.P [Member] USD ($)	Mar. 31, 2014 Prologis, L.P [Member] USD ($)	Dec. 31, 2013 Prologis, L.P [Member] USD ($)	Dec. 31, 2010 BMR-Gateway Boulevard LLC [Member] USD ($)	Mar. 31, 2014 BMR-Gateway Boulevard LLC [Member] USD ($)	Dec. 31, 2013 BMR-Gateway Boulevard LLC [Member] USD ($)	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
Interest rate for remaining bond series		9.50%
Outstanding principal		71,250	125,000
Period of maturity		2014-08
Term of lease				10 years			11 years 6 months			3 years
Rent over term of lease				3,497,000			17,869,000
Deferred rent under sublease agreement		47,231	34,366		392,000	391,000		1,437,000	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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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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