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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 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
May 31, 2013
Apr. 30, 2013
Jan. 31, 2011
Dec. 31, 2009
Dec. 31, 2013
Employee [Member]
Dec. 31, 2012
Employee [Member]
Dec. 31, 2011
Employee [Member]
Dec. 31, 2013
Research and Development Expense [Member]
Dec. 31, 2012
Research and Development Expense [Member]
Dec. 31, 2011
Research and Development Expense [Member]
Dec. 31, 2013
General and Administrative Expense [Member]
Dec. 31, 2012
General and Administrative Expense [Member]
Dec. 31, 2011
General and Administrative Expense [Member]
Dec. 31, 2013
Non Employee [Member]
Dec. 31, 2012
Non Employee [Member]
Dec. 31, 2011
Non Employee [Member]
May 14, 2010
Stock and Cash Based Incentive Plan [Member]
Dec. 31, 2013
Stock and Cash Based Incentive Plan [Member]
Dec. 31, 2013
Amended 2000 Stock Option Plan [Member]
Aug. 31, 2012
Common Stock Warrants [Member]
Dec. 31, 2013
Common Stock Warrants [Member]
Jun. 30, 2012
Sales Agreement [Member]
Dec. 31, 2013
Sales Agreement [Member]
Dec. 31, 2012
Sales Agreement [Member]
Mar. 31, 2013
Underwritten public offering [Member]
Dec. 31, 2011
Underwritten public offering [Member]
Dec. 31, 2013
Underwritten public offering [Member]
Dec. 31, 2012
Underwritten public offering [Member]
Dec. 31, 2012
Overallotment option [Member]
Jan. 31, 2011
Investor purchase agreements [Member]
Dec. 31, 2013
Investor purchase agreements [Member]
Dec. 31, 2012
Investor purchase agreements [Member]
Dec. 31, 2013
VGX Equity Compensation Plan [Member]
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Series C Preferred Stock [Member]
Dec. 31, 2012
Series C Preferred Stock [Member]
Dec. 31, 2013
March 2013 financing [Member]
Dec. 31, 2012
March 2013 financing [Member]
Dec. 31, 2013
December Two Thousand Eleven Financing [Member]
Dec. 31, 2012
December Two Thousand Eleven Financing [Member]
Dec. 31, 2013
January Two Thousand Eleven Financing [Member]
Dec. 31, 2012
January Two Thousand Eleven Financing [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]                                                                                          
Common stock, shares authorized 600,000,000 300,000,000   600,000,000 300,000,000                                                                                
Common stock, capital shares reserved for future issuance                                                       27,377,266                                  
Class of warrant or right, number of securities called by warrants or rights                                                       13,688,633                                  
Class of warrant or right, number of securities called by each warrant or right                                                       0.50                                  
Class of warrant or right, securities called by warrants or rights, price per share                                                       $ 0.7936                                  
Potential proceeds from issue of common stock                                                       $ 14,000,000                                  
Warrants, fair value disclosure                                                       6,000,000                                  
Increase (decrease) in fair value of warrants                                                           25,000,000.0                              
Stock issued during period, shares, warrants exercised                                                                               10,665,908   5,774,784   3,870,200  
Transaction costs associated with issuance of warrants 315,970 0 0                                                                                    
Potential sales proceeds                                                 25,000,000.0                                        
Rate of commission or discount rate to placement agent                                                 3.00%                                        
Shares of common stock sold under sales agreement                                                   15,700,668 9,344,611                                    
Weighted average price per share on sale of common stock $ 1.24 $ 0.59                                                                                      
Net proceeds from the transaction                                                   18,900,000 5,300,000   3,700,000       23,000,000             8,500,000   3,800,000   5,400,000  
Common stock shares issued 210,304,821 144,313,005                                                         7,699,712 962,465 21,130,400                        
Warrants to purchase number of shares of common stock 14,059,260 21,593,844                                                         5,774,784   10,565,200             3,022,725 0 0 5,774,784 6,695,000 10,565,200
Purchase price per unit of common stock and warrant                                                       0.55 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 6 months     5 years   5 years                        
Exercise Price           1.40                                                 0.65                 0.79 0.79 0.65 0.65 1.40 1.40
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                                                           (4,900,000) 115,000     (15,800,000) 2,400,000                    
Aggregate purchase price under securities purchase agreement                                                                 24,300,000                        
First exercisable date from the date of issuance in days                                                                 180 days                        
Class of warrant or right, number of warrants exercised 3,870,200                                                                                        
Warrants expired to purchase number of shares of common stock                                             150,000 58,220                                          
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                                         11,915,993                                                
Increased aggregate number of shares available for grants under the Incentive Plan                                         1,197,306                                                
Number of shares of vested restricted stock outstanding under the plan                                         240,000                                                
Number of common stock outstanding under the Incentive Plan                                         9,163,063                                                
Vesting period of Incentive Plan 3 years                                                                                        
Contractual year term of Incentive Plan 10 years                                                                                        
Number of options outstanding to purchase common stock 16,538,118 16,257,444 14,302,803       12,649,968                   4,794,496         1,091,750                           6,283,305                  
Share-based Compensation 1,868,345 1,345,613 1,654,823         1,200,000 1,200,000 1,600,000 550,000 555,000 472,000 605,000 638,000 1,100,000                                                          
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized 956,000 944,000                                                                                      
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition 1 year 10 months 0 days 1 year 10 months 24 days                                                                                      
Allocated Share-based Compensation Expense                                 714,000 153,000 33,000                                                    
Aggregate intrinsic value of options outstanding 28,700,000                                                                                        
Aggregate intrinsic value for options exercisable 20,100,000                                                                                        
Options exercisable, remaining contractual term 4 years 8 months 12 days                                                                                        
Number of options expected to vest 3,540,163                                                                                        
Options, expirations in period, weighted average exercise price $ 1.33 $ 1.83 $ 2.08                                                                                    
Options, expirations in period 496,012 207,498 100,000                                                                                    
Options, grants in period, weighted average grant date fair value $ 0.44 $ 0.47 $ 0.90                                                                                    
Proceeds from stock options exercised 1,600,000 0 16,000                                                                                    
Options, exercises in period, aggregate intrinsic value $ 2,500,000 $ 0 $ 65,000