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Stock Options and Warrants - Additional Information2 (Detail) (USD $)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 145 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 9 Months Ended
Jul. 24, 2013
Jul. 31, 2013
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2011
Dec. 31, 2008
Sep. 30, 2013
Mar. 12, 2013
Jan. 22, 2013
Dec. 31, 2012
Dec. 31, 2007
Dec. 31, 2006
Dec. 31, 2007
Minimum [Member]
Dec. 31, 2007
Maximum [Member]
Sep. 30, 2013
Maximum [Member]
Jul. 24, 2013
Series B Warrants [Member]
Sep. 30, 2013
Series B Warrants [Member]
Sep. 30, 2013
Common Stock [Member]
Jul. 24, 2013
Series A Warrants [Member]
Sep. 30, 2013
Series A Warrants [Member]
Jul. 19, 2013
Placement Agent Warrants [Member]
Sep. 30, 2013
Placement Agent Warrants [Member]
Sep. 30, 2013
U.S. Treasury Notes [Member]
Jul. 19, 2013
Series B Warrants [Member]
Sep. 30, 2013
Series B Warrants [Member]
Sep. 30, 2013
Series B Warrants [Member]
Jul. 24, 2013
Series B Warrants [Member]
Sep. 30, 2013
Series B Warrants [Member]
U.S. Treasury Notes [Member]
Jul. 19, 2013
Series A Warrants [Member]
Sep. 30, 2013
Series A Warrants [Member]
Sep. 30, 2013
Series A Warrants [Member]
U.S. Treasury Notes [Member]
Sep. 30, 2013
Bio Time [Member]
Sep. 30, 2011
Bio Time [Member]
Dec. 31, 2011
Bio Time [Member]
Tranches
Dec. 31, 2008
Bio Time [Member]
Sep. 30, 2012
Bio Time [Member]
Jun. 30, 2008
Bio Time [Member]
Dec. 31, 2011
Bio Time [Member]
Minimum [Member]
Sep. 30, 2011
Bio Time [Member]
Maximum [Member]
Dec. 31, 2011
Bio Time [Member]
Maximum [Member]
Sep. 30, 2013
Series A Preferred Stock [Member]
Jan. 15, 2008
Series A Preferred Stock [Member]
Jan. 31, 2013
Series A Preferred Stock [Member]
Warrants Issued with Preferred Stock [Member]
Dec. 31, 2010
Series A Preferred Stock [Member]
Warrants Issued with Preferred Stock [Member]
Dec. 31, 2008
Series A Preferred Stock [Member]
Warrants Issued with Preferred Stock [Member]
Sep. 30, 2013
Series B Preferred Stock [Member]
Sep. 30, 2013
Series B Preferred Stock [Member]
Warrants Issued with Preferred Stock [Member]
Dec. 31, 2012
Series B Preferred Stock [Member]
Warrants Issued with Preferred Stock [Member]
Dec. 31, 2008
Series B Preferred Stock [Member]
Warrants Issued with Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                                      
Brookstreet Warrants outstanding                                                                             30,000           1,600,000 400,000 2   0 300,000 2
Warrant exercised                   0.20 0.20             0.15     0.15   0.15                               0.25                     0.20  
Expiry date of warrants                                   Oct. 24, 2013                                     Dec. 31, 2012           Jan. 31, 2013         Jul. 31, 2013      
Sale of common stock     134,169,565   134,169,565       134,169,565 5,000,000 10,125,000 87,388,815 1,370,000 1,350,000       20,000,000                                                       800,000 1       1
Shares issued                   2,500,000 5,062,500                 1,700,000 20,000,000 1,700,000                                                          
Class of warrant or right term         5 years                         65 days         5 years               5 years                                        
Number of units issued 20,000,000                                   1,700,000                                                                
Maturity term                                         5 years                                                            
Warrants exercise price                                                   $ 0.15                                                  
Closing bid price of common stock                                                         80.00%                                            
Warrants expiration date                                   Oct. 24, 2013                                                                  
Number of warrants exercised                                     1,700,000                                                                
Proceeds from issuance of common stock and warrants   $ 2,400,000                                 $ 242,000               $ 242,000                                                
Stock price     $ 0.15   $ 0.15       $ 0.15               $ 0.15                                                                    
Warrant exercise price     $ 0.15   $ 0.15       $ 0.15                                                                                    
Stock price volatility         87.70%                                                                                            
Risk free interest rate                                                 1.33%     0.03%   0.03%     1.33%                                    
Period     0 years 5 years 7 months 6 days 6 years 1 month 6 days 5 years 8 months 12 days   5 years             5 years 3 years                       26 days       5 years   5 years                                  
Capital raised on stock issuance per share                         $ 1.00       $ 0.15                                                     $ 1              
Warrants description         Monte-Carlo simulation method                                                                                            
Fair value of warrant liability in excess of proceeds     1,390,000   1,390,000       1,390,000                                                                                    
Fair value of warrants at issuance                                               115,000     2,650,000 2,650,000       1,720,000                                      
Warrant liabilities 4,500,000   4,400,000   4,400,000       4,400,000                                                                                    
Change in fair value of warrants     27,000   27,000 38,000     (1,330,000)                                                                                    
Advance                                                                             $ 250,000                        
Number of tranches of common stock warrants issuable                                                                       2                              
Number of shares which can be purchased by the exercise of warrants                                                                       100,000                              
Strike prices                                                                     2.00         1.50 2.00                    
Vesting over four quarters             Four quarters                                                                                        
Options vesting terms                                                                                   5 years                  
Number of warrants vested during period                                                                           100,000                          
Risk free interest rates     0.00% 0.88% 0.95% 0.94%                 4.58% 5.13%                                                                      
Dividend yield     0.00% 0.00% 0.00% 0.00%   0.00%             0.00% 0.00%                                   0.00%                                  
Volatility rate minimum     0.00% 124.93% 118.34% 123.63%                 63.00% 71.00%                                   134.00%