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Commitments and Contingencies - Additional Information (Detail)	1 Months Ended	9 Months Ended		1 Months Ended		1 Months Ended	9 Months Ended	1 Months Ended			0 Months Ended	1 Months Ended
	Jul. 31, 2006 Claim	Sep. 30, 2013 USD ($)	Dec. 31, 2012 USD ($)	Mar. 31, 2013 Prologis, L.P [Member] USD ($)	Sep. 30, 2013 Prologis, L.P [Member] USD ($)	Sep. 30, 2010 Caliper Life Sciences, Inc [Member] USD ($)	Sep. 30, 2013 Caliper Life Sciences, Inc [Member]	Dec. 31, 2010 BMR-Gateway Boulevard LLC [Member] USD ($)	Sep. 30, 2013 BMR-Gateway Boulevard LLC [Member] USD ($)	Dec. 31, 2012 BMR-Gateway Boulevard LLC [Member] USD ($)	Oct. 31, 2013 Stem Cell Sciences (U.K.) Ltd [Member] Subsequent Events [Member] Patents	Oct. 31, 2013 Stem Cell Sciences (U.K.) Ltd [Member] Subsequent Events [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		179,000	331,000
Period of maturity		2014-08
Term of lease		15 years		10 years		2 years		11 years 6 months				3 years
Rent over term of lease		1,165,000		3,497,000		1,081,000		17,869,000
Lease term expires		Jun. 30, 2013					Sep. 30, 2013
Deferred rent under sublease agreement		28,050			389,000				1,432,000	1,389,000
Rental payments under the existing lease												£ 53,000
Number of patients violate claims of Neuralstem's activities	4
Number of patents acquired											6
Shares issued		329,131									139,548	139,548

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