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Common Stock - Additional Information (Detail) (USD $)
 1 Months Ended 9 Months Ended 12 Months Ended 6 Months Ended 1 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2013
Dec. 31, 2011
Jan. 31, 2011
Sep. 30, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2013
Institutional Investors [Member]
Oct. 31, 2013
Stem Cell Sciences (U.K.) Ltd [Member]
Patents
Oct. 31, 2013
Outstanding warrants [Member]
Nov. 30, 2008
Outstanding warrants [Member]
Dec. 31, 2013
Series A Warrants [Member]
Dec. 31, 2012
Series A Warrants [Member]
Jun. 30, 2012
Series B Warrant [Member]
Dec. 31, 2012
Series B Warrant [Member]
Dec. 31, 2011
Series B Warrant [Member]
Jun. 30, 2012
Series A Warrants [Member]
Dec. 31, 2013
Series A Warrants [Member]
Dec. 31, 2012
Series A Warrants [Member]
Dec. 31, 2011
Series A Warrants [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
December 2011 Financing [Member]
Series A Warrants [Member]
Dec. 31, 2012
December 2011 Financing [Member]
Series A Warrants [Member]
Oct. 31, 2013
Common Stock [Member]
Jun. 30, 2012
Common Stock [Member]
Dec. 31, 2012
Common Stock [Member]
Dec. 31, 2013
Common Stock [Member]
Dec. 31, 2011
Common Stock [Member]
Dec. 31, 2010
Common Stock [Member]
Jun. 30, 2013
Common Stock [Member]
Institutional Investors [Member]
Dec. 31, 2013
Common Stock [Member]
December 2011 Financing [Member]
Dec. 31, 2012
Common Stock [Member]
December 2011 Financing [Member]
Dec. 31, 2011
Common Stock [Member]
December 2011 Financing [Member]
Series A Warrants [Member]
Subsidiary, Sale of Stock [Line Items]                                                                    
Shares authorized         225,000,000 225,000,000                             75,000,000 225,000,000                        
Common stock issued in public offering 12,845,500                                     8,000,000                     329,131 384,534 2,700,000  
Sale of common stock and warrant, price per share $ 1.45   $ 10.00   $ 1.91 $ 2.12 $ 2.47                                                      
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             1    
Warrant exercise price 1.80                     1.40       1.25                                   1.40
Warrant expiration period 5 years                                                                  
Shares available to sale               30,000,000                                                    
Common stock, sold                                                             1,645,639      
Sale of stock, price per share                                                             $ 1.823      
Gross proceeds from common stock     9,400,000   23,491,597 19,747,550 19,774,820 3,000,000                                                    
Exercise period of rights               3 years                                                    
Additional amounts of common stock to sell               27,000,000                                                    
Warrants termination agreement         2013-10                                                          
Common stock, sold     1,000,000   1,733,771 9,647,471 525,116                                                      
Sales agent is paid compensation equal to 3% of gross proceeds         3.00% 3.00% 3.00%                                                      
Number of warrants exercised                                   384,534         384,534                      
Proceeds from sale of stock                       538,000 3,078,000                                          
Number of warrants exercised                           2,700,000         2,198,571       384,534 2,198,571                    
Gross proceeds         530,097 6,256,438               3,375,000   10,000,000     3,078,000                              
Number of warrants expired                             5,300,000                                      
Warrant expiration date                             May 02, 2012                                      
Number of shares issued upon warrants exercise                                               2,700,000   2,700,000 2,198,571         384,534 2,198,571  
Number of warrants issued                                 2,700,000                                  
Series B Warrants issued in public offering                               8,000,000                                    
Exercise price of warrant                                     $ 1.40                              
Class of warrant date until which warrants exercisable description                                     Will expire on the fifth anniversary of the closing date of the initial financing transaction in December 2011.                              
Warrant right and unit combination description   Each Unit consists of one share of our common stock and one Series A warrant. Each Series A warrant gives the holder the right to purchase one share of our common stock at an initial exercise price of $1.40 per share.                                                                
Stock options granted to investors     6,000,000       3,750                                                      
Grant date value     $ 10.00                                                              
Stock options given to investor expiry date     Feb. 18, 2011                                                              
Number of patents acquired                 6                                                  
Shares issued                 139,548                                   37,506,305 55,138,311 22,427,955 12,731,287        
Fair value of common Stock       $ 200,000         $ 200,000