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Commitments and Contingencies (Details Textual) | 1 Months Ended | 3 Months Ended |  | 1 Months Ended | 3 Months Ended | 1 Months Ended |  |  |  | 1 Months Ended | 3 Months Ended | 1 Months Ended
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Jul. 31, 2006 Claim | Mar. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Sep. 30, 2010 Caliper Life Sciences [Member] USD ($) sqft | Mar. 31, 2013 Caliper Life Sciences [Member] | Dec. 31, 2010 BMR-Gateway Boulevard LLC [Member] USD ($) sqft | Mar. 31, 2013 BMR-Gateway Boulevard LLC [Member] USD ($) | Jan. 31, 2013 BMR-Gateway Boulevard LLC [Member] sqft | Dec. 31, 2012 BMR-Gateway Boulevard LLC [Member] USD ($) | Jan. 31, 2011 Stem Cell Sciences UK [Member] GBP (£) sqft | Mar. 31, 2013 Stem Cell Sciences UK [Member] USD ($) | Mar. 31, 2013 Prologis LP [Member] USD ($) sqft
Commitments and Contingencies (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Term of lease |  | 15 years |  | 2 years |  | 11 years 6 months |  |  |  |  |  | 10 years
Rent over term of lease |  | $ 124,000 |  | $ 1,081,000 |  | $ 17,869,000 |  |  |  |  |  | $ 3,497,000
Deferred rent under sublease agreement |  |  |  |  |  |  | 1,405,000 |  | 1,389,000 |  |  |
Additional area of facility |  |  |  |  |  |  |  | 30,000 |  |  |  |
Area of leased space |  |  |  |  |  |  |  |  |  | 5,000 |  |
Area of lease reduced |  |  |  |  |  |  |  |  |  | 1,900 |  |
Rental payments |  |  |  |  |  |  |  |  |  | 61,000 |  |
Annual payments |  |  |  |  |  |  |  |  |  |  | 50,000 |
Square feet area of office and lab space under lease |  |  |  | 13,200 |  | 43,000 |  |  |  |  |  | 18,700
Useful life |  |  |  |  |  |  |  |  |  |  | 14 years |
Litigation costs |  |  |  |  |  |  |  |  |  |  | 700,000 |
Royalty payments |  |  |  |  |  |  |  |  |  |  | 600,000 |
Lease term expires |  | Jun. 30, 2013 |  |  | Sep. 30, 2013 |  |  |  |  |  |  |
Sublease agreement |  |  |  |  | 2 years |  |  |  |  |  |  |
Commitments and Contingencies (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the issuance of industrial revenue bonds |  | 5,000,000 |  |  |  |  |  |  |  |  |  |
Period of maturity |  | 2014-08 |  |  |  |  |  |  |  |  |  |
Interest rate for remaining bond series |  | 9.50% |  |  |  |  |  |  |  |  |  |
Outstanding principal |  | 281,000 | 331,000 |  |  |  |  |  |  |  |  |
Reducing lieu of cash payments |  | 50,000 |  |  |  |  |  |  |  |  |  |
Payments creditable against royalties |  | $ 50,000 |  |  |  |  |  |  |  |  |  |
Number of patients violate claims of Neuralstem's activities | 4 |  |  |  |  |  |  |  |  |  |  |
Amortization period of legal cost |  | 14 years |  |  |  |  |  |  |  |  |  |

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