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Stockholders' Equity (Details Textual) (USD $)
 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 1 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
May 14, 2010
Stock and Cash Based Incentive Plan [Member]
Mar. 31, 2014
Stock and Cash Based Incentive Plan [Member]
Mar. 31, 2014
Amended 2000 Stock Option Plan [Member]
Mar. 07, 2013
Underwritten public offering [Member]
Mar. 31, 2013
Underwritten public offering [Member]
Mar. 31, 2014
VGX Equity Compensation Plan [Member]
Mar. 31, 2014
Common Stock [Member]
Underwritten public offering [Member]
Mar. 31, 2014
Common Stock [Member]
Underwritten public offering overallotment option [Member]
Mar. 31, 2014
March 2013 Financing [Member]
Mar. 31, 2014
March 2013 Financing [Member]
Mar. 31, 2014
January 2011 financing [Member]
Class of Stock [Line Items]                          
Stock issued during period                 21,810,900        
Common stock, capital shares reserved for future issuance             27,377,266     2,844,900      
Public offering price, per share                 $ 2.90        
Proceeds from issuance of common stock $ 59,209,182 $ 19,556,383         $ 14,000,000   $ 59,200,000        
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              
Transaction costs associated with issuance of warrants 0 315,970                      
Number of common stock issued related to warrants exercised                     909,091 11,574,999 6,695,000
Proceeds from issuance of common stock and warrants                     $ 721,000   $ 9,400,000
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       13,971,324                  
Number of shares available for grant       210,846                  
Number of shares of vested restricted stock outstanding under plan       240,000                  
Common stock, other shares, outstanding       11,942,334                  
Award vesting period 3 years                        
Maximum contractual term 10 years                        
Options, outstanding, number         809,250     6,196,794