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Stockholders' Equity (Details Textual) (USD $)
 9 Months Ended 0 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 12 Months Ended 3 Months Ended
Sep. 30, 2013
Sep. 30, 2012
May 31, 2013
Apr. 30, 2013
Dec. 31, 2012
May 14, 2010
Stock and Cash Based Incentive Plan [Member]
Sep. 30, 2013
Stock and Cash Based Incentive Plan [Member]
Sep. 30, 2013
Amended 2000 Stock Option Plan [Member]
Aug. 31, 2012
Common Stock Warrants [Member]
Sep. 30, 2013
Common Stock Warrants [Member]
Mar. 31, 2013
Underwritten public offering [Member]
Sep. 30, 2013
Underwritten public offering [Member]
Sep. 30, 2013
Underwritten public offering [Member]
Jun. 30, 2012
Sales Agreement [Member]
Dec. 31, 2012
Sales Agreement [Member]
Sep. 30, 2013
VGX Equity Compensation Plan [Member]
Sep. 30, 2013
March 2013 Financing [Member]
Sep. 30, 2013
December 2011 financing [Member]
Sep. 30, 2013
January 2011 financing [Member]
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                
Common stock purchase warrant                     13,688,633                
Purchase price per unit of common stock and warrant                     0.55                
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                
Term of the warrants in years                     5 years 6 months                
Potential proceeds from issue of common stock                     $ 14,000,000                
Warrants, Fair Value Disclosure                     6,000,000                
Increase in fair value of warrants                       19,600,000.0 22,700,000.0            
Stock Issued During Period, Shares, Warrants Exercised 20,584,997                               10,290,908 5,774,784 3,665,200
Transaction costs associated with issuance of warrants 315,970 0                                  
Potential proceeds from sale of common stock through placement agent for resale                           25,000,000.0          
Rate of commission or discount to placement agent                           3.00%          
Common stock sold under sales agreement 14,011,526                           9,344,611        
Weighted average price per share on sale of common stock $ 1.11       $ 0.59                            
Proceeds from issuance of common stock and warrants $ 15,100,000                           $ 5,300,000   $ 8,200,000 $ 3,800,000 $ 5,100,000
Warrants expired to purchase number of shares of common stock                 150,000 58,220                  
Number of additional shares authorized           2,000,000                          
Number of potential shares authorized for issuance under share based compensation plan           2,055,331                          
Number of shares authorized             11,915,993                        
Number of shares available for grant             1,218,868                        
Number of shares of vested restricted stock outstanding under plan             240,000                        
Common stock, other shares, outstanding             9,259,626                        
Award vesting period 3 years                                    
Maximum contractual term 10 years                                    
Options, outstanding, number               1,147,999               6,574,572