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Stock Options and Warrants - Additional Information2 (Detail) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2008
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]
Jun. 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]
Jun. 30, 2013
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]
Jun. 30, 2013
Series B Preferred stock [Member]
Jun. 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   300,000 300,000 2
Warrant exercised             0.20 0.20                     0.25                   0.25  
Expiry date of warrants                                 Dec. 31, 2012           Jan. 31, 2013       Jul. 31, 2014      
Sale of common stock 112,590,815   112,590,815       5,000,000 10,125,000 87,388,815 1,370,000 1,350,000                           800,000 1       1
Warrant to purchase common stock             2,500,000 5,062,500                                            
Class of warrant or right term     5 years                                                      
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         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 0.95% 0.91% 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 118.34% 124.20% 118.34% 124.68%               63.00% 71.00% 134.00%                                
Period 6 years 1 month 6 days 5 years 7 months 6 days 6 years 1 month 6 days 5 years 7 months 6 days   5 years           5 years 3 years 5 years