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Stockholders' Equity (Details Textual) (USD $)
 1 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 16 Months Ended 9 Months Ended
Jul. 31, 2014
Sep. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
May 22, 2014
Stock and Cash Based Incentive Plan [Member]
May 14, 2010
Stock and Cash Based Incentive Plan [Member]
Sep. 30, 2014
Stock and Cash Based Incentive Plan [Member]
Sep. 30, 2014
Amended 2000 Stock Option Plan [Member]
Mar. 31, 2013
Underwritten public offering [Member]
Sep. 30, 2014
VGX Equity Compensation Plan [Member]
Sep. 30, 2014
Series C Preferred Stock [Member]
Sep. 30, 2014
Common Stock [Member]
Mar. 31, 2014
Common Stock [Member]
Underwritten public offering [Member]
Mar. 31, 2014
Common Stock [Member]
Underwritten Public Offering Overallotment Option [Member]
Sep. 30, 2014
March 2013 Financing [Member]
Jun. 30, 2014
March 2013 Financing [Member]
Sep. 30, 2014
January 2011 financing [Member]
Stockholders' Equity (Textual) [Abstract]                                  
Number of shares converted                     3            
Number of shares issued upon conversion                       1,103          
Stock issued during period                         5,452,725        
Common stock, shares authorized   600,000,000 600,000,000                            
Common stock, capital shares reserved for future issuance                 6,844,317         711,225      
Public offering price, per share                         $ 11.60        
Proceeds from issuance of common stock     $ 59,209,182 $ 29,077,495                 $ 59,200,000        
Common stock purchase warrant                 3,422,158                
Purchase price per unit of common stock and warrant                 2.2                
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                 $ 3.1744                
Term of the warrants in years                 5 years 6 months                
Potential proceeds from issue of common stock                 14,000,000                
Number of common stock issued related to warrants exercised   97,865 2,169,342                       471,590 3,138,067 1,673,750
Transaction costs associated with issuance of warrants     0 315,970                          
Proceeds from issuance of common stock and warrants                             $ 1,500,000   $ 9,400,000
Shares represented by expired warrants 83,334                                
Number of additional shares authorized         1,250,000 500,000                      
Number of potential shares authorized for issuance under share based compensation plan           513,833                      
Number of shares authorized             4,742,831                    
Number of shares available for grant             1,007,294                    
Number of shares of vested restricted stock outstanding under plan             60,000                    
Common stock, other shares, outstanding             3,259,801                    
Award vesting period     3 years                            
Maximum contractual term     10 years                            
Options, outstanding, number               197,629   1,376,447