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Stockholders' Equity (Details Textual) (USD $)
 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jan. 31, 2011
Dec. 31, 2009
Dec. 31, 2012
Employee [Member]
Dec. 31, 2011
Employee [Member]
Dec. 31, 2010
Employee [Member]
Dec. 31, 2012
Research and Development Expense [Member]
Dec. 31, 2011
Research and Development Expense [Member]
Dec. 31, 2010
Research and Development Expense [Member]
Dec. 31, 2012
General and Administrative Expense [Member]
Dec. 31, 2011
General and Administrative Expense [Member]
Dec. 31, 2010
General and Administrative Expense [Member]
Dec. 31, 2012
Non Employee [Member]
Dec. 31, 2011
Non Employee [Member]
Dec. 31, 2010
Non Employee [Member]
May 14, 2010
Stock and Cash Based Incentive Plan [Member]
Dec. 31, 2012
Stock and Cash Based Incentive Plan [Member]
Dec. 31, 2012
Amended 2000 Stock Option Plan [Member]
Aug. 31, 2012
Common Stock Warrants [Member]
Oct. 31, 2011
Common Stock Warrants [Member]
Dec. 31, 2010
Common Stock Warrants [Member]
Sep. 30, 2010
Common Stock Warrants [Member]
Jun. 30, 2012
Sales Agreement [Member]
Aug. 31, 2010
Sales Agreement [Member]
Dec. 31, 2012
Sales Agreement [Member]
Dec. 31, 2011
Sales Agreement [Member]
Dec. 31, 2010
Sales Agreement [Member]
Dec. 31, 2011
Underwritten public offering [Member]
Dec. 31, 2012
Underwritten public offering [Member]
Dec. 31, 2011
Underwritten public offering [Member]
Dec. 31, 2011
Overallotment option [Member]
Jan. 31, 2011
Investor purchase agreements [Member]
Dec. 31, 2012
Investor purchase agreements [Member]
Dec. 31, 2011
Investor purchase agreements [Member]
Dec. 31, 2012
VGX Equity Compensation Plan [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
Series C Preferred Stock [Member]
Dec. 31, 2011
Series C Preferred Stock [Member]
Preferred Stock [Abstract]                                                                                
Preferred stock, redemption price per share                                                                             $ 10,000  
Preferred stock, par value (Dollars per share) $ 0.001 $ 0.001                                                                         $ 0.001 $ 0.001
Notice period for mandatory conversion of preferred stock                                                                             30 days  
Average daily trading volume triggering mandatory conversion                                                                           25,000    
Convertible preferred stock, shares issued upon conversion                                                                             38,233  
Convertible preferred stock, shares issued upon conversion, conversion price per share $ 6.80                                                                              
Daily market price triggering mandatory conversion $ 18.00                                                                              
Stockholders' Equity (Textual) [Abstract]                                                                                
Potential sales proceeds                                                 $ 25,000,000.0 $ 25,000,000.0                            
Rate of commission or discount rate to placement agent                                                 3.00% 3.00%                            
Shares of common stock sold under sales agreement                                                     9,344,611 3,023,577 3,023,577                      
Weighted average price per share on sale of common stock $ 0.59 $ 1.25 $ 1.25                                                                          
Net proceeds from the transaction                                                     5,300,000 3,700,000 3,700,000 3,700,000       23,000,000            
Common stock shares issued 144,313,005 134,968,394                                                       7,699,712   7,699,712 962,465 21,130,400            
Warrants to purchase number of shares of common stock 21,593,844 21,743,844                                                       5,774,784   5,774,784   10,565,200            
Purchase price per unit of common stock and warrant                                                           0.5195       1.15            
Ratio to determine the number of warrants received per one share of common stock sold                                                           0.75       0.50            
Term of the warrants in years                                                               5 years   5 years            
Exercise Price       1.40                                                   0.65   0.65                
Closing bid price of warrants, minimum                                                           $ 1.30       $ 2.80            
Trading date of warrants in days                                                           20 days       20 days            
Change in fair value of warrants                                                             115,000 58,000     2,400,000 8,600,000        
Aggregate purchase price under securities purchase agreement                                                                   24,300,000            
First exercisable date from the date of issuance in days                                                                   180 days            
Reimbursement of expenses to placement agent 30,000                                                                              
Reimbursement of expenses, ongoing maintenance due diligence and other, placement agent 5,000                                                                              
Warrants expired to purchase number of shares of common stock                                         150,000 2,364,394 3,462,451 150,000                                
Increased number of securities available for future issuance                                   2,000,000                                            
Number of potential shares authorized for issuance under a share-based compensation plan                                   2,055,331                                            
Reserved number of shares under the Incentive Plan                                     9,860,662                                          
Increased aggregate number of shares available for grants under the Incentive Plan                                     1,875,287                                          
Number of shares of vested restricted stock outstanding under the plan                                     240,000                                          
Number of common stock outstanding under the Incentive Plan                                     7,430,162                                          
Vesting period of Incentive Plan 3 years                                                                              
Contractual year term of Incentive Plan 10 years                                                                              
Number of options outstanding to purchase common stock 16,257,444 14,302,803 12,649,968   13,142,039                   6,704,409         1,371,435                                 7,455,847      
Share-based Compensation 1,345,613 1,654,823 1,174,867     1,200,000 1,600,000 898,000 555,000 472,000 281,000 638,000 1,100,000 617,000                                                    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 944,000 981,000                                                                            
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 10 months 24 days 1 year 8 months 12 days                                                                            
Allocated Share-based Compensation Expense                             153,000 33,000 277,000                                              
Aggregate intrinsic value of options outstanding 1,100,000 294,000                                                                            
Aggregate intrinsic value for options exercisable 901,000 294,000                                                                            
Options exercisable, remaining contractual term 4 years 8 months 12 days 5 years                                                                            
Options, expirations in period, weighted average exercise price $ 1.83 $ 2.08 $ 15.28                                                                          
Options, expirations in period 207,498 100,000 4,250                                                                          
Options, grants in period, weighted average grant date fair value $ 0.47 $ 0.90 $ 0.93                                                                          
Proceeds from Stock Options Exercised 0 15,930 168,665                                                                          
Options, exercises in period, aggregate intrinsic value $ 0 $ 65,000 $ 193,000