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Subsequent Events - Additional Information (Detail) (USD $)
 9 Months Ended 1 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Nov. 30, 2008
Warrant liabilities [Member]
Sep. 30, 2013
Series A Warrants [Member]
Oct. 31, 2013
Subsequent Events [Member]
Sep. 30, 2013
Subsequent Events [Member]
Oct. 31, 2013
Subsequent Events [Member]
Warrant liabilities [Member]
Sep. 30, 2013
Subsequent Events [Member]
Series A Warrants [Member]
Oct. 31, 2013
Subsequent Events [Member]
Stem Cell Sciences (U.K.) Ltd [Member]
Patents
Oct. 31, 2013
Subsequent Events [Member]
Common Stock [Member]
Sep. 30, 2013
Subsequent Events [Member]
Common Stock [Member]
Subsequent Event [Line Items]                        
Number of shares of common stock and warrants           12,845,500            
Sale of common stock and warrant, price per share           $ 1.45            
Proceeds from issuance of common stock and warrants           $ 17,300,000            
Common stock, par value $ 0.01   $ 0.01     $ 0.01            
Number of shares of common stock or warrant in each unit sold to institutional investors       1       1     1  
Number of securities callable by each warrant or right warrants                     0.5  
Warrant exercise price         1.40 1.80     1.40      
Warrant expiration period           5 years            
Warrant exercise shares                 50,000      
Proceeds from the exercise of warrants $ 460,097 $ 4,153,584         $ 70,000          
Warrant common stock share issued                       50,000
Number of patents acquired                   6    
Shares issued 329,131                 139,548