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Stockholders' Equity (Details Textual)
 1 Months Ended 3 Months Ended 9 Months Ended
May. 08, 2015
shares
May. 05, 2015
USD ($)
$ / shares
shares
May. 22, 2014
shares
May. 14, 2010
shares
Mar. 31, 2014
USD ($)
$ / shares
shares
Mar. 31, 2013
USD ($)
$ / shares
$ / Unit
shares
Sep. 30, 2015
shares
Sep. 30, 2014
shares
Sep. 30, 2015
USD ($)
plan
shares
Sep. 30, 2014
USD ($)
shares
Stockholders' Equity (Textual) [Abstract]                    
Stock issued during period (shares)   10,925,000                
Offering price ($ per share) | $ / shares   $ 8.00                
Proceeds from initial public offering | $   $ 81,900,000                
Proceeds from issuance of common stock | $                 $ 81,902,363 $ 59,209,182
Number of common stock issued related to warrants exercised (shares)             0 97,865 0 2,169,342
Number of plans | plan                 1  
Award vesting period                 3 years  
Maximum contractual term                 10 years  
Stock and Cash Based Incentive Plan [Member]                    
Stockholders' Equity (Textual) [Abstract]                    
Number of additional shares authorized 2,000,000   1,250,000 500,000            
Number of potential shares authorized for issuance under share based compensation plan       513,833            
Number of shares authorized             6,729,052   6,729,052  
Number of shares available for grant             2,032,801   2,032,801  
Number of shares of unvested restricted stock units and options outstanding             230,000   230,000  
Common stock, other shares, outstanding (shares)             4,466,251   4,466,251  
Amended 2000 Stock Option Plan [Member]                    
Stockholders' Equity (Textual) [Abstract]                    
Options outstanding (shares)             148,878   148,878  
Underwritten public offering [Member]                    
Stockholders' Equity (Textual) [Abstract]                    
Common stock, capital shares reserved for future issuance (shares)           6,844,317        
Common stock purchase warrant (in shares)           3,422,158        
Purchase price per unit of common stock and warrant ($ per unit) | $ / Unit           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 ($ per share) | $ / shares           $ 3.1744        
Potential proceeds from issue of common stock | $           $ 14,000,000        
VGX Equity Compensation Plan [Member]                    
Stockholders' Equity (Textual) [Abstract]                    
Options outstanding (shares)             1,260,082   1,260,082  
Common Stock [Member] | Underwritten public offering [Member]                    
Stockholders' Equity (Textual) [Abstract]                    
Stock issued during period (shares)         5,452,725          
Public offering price ($ per share) | $ / shares         $ 11.60          
Proceeds from issuance of common stock | $         $ 59,200,000          
Common Stock [Member] | Underwritten Public Offering Overallotment Option [Member]                    
Stockholders' Equity (Textual) [Abstract]                    
Common stock, capital shares reserved for future issuance (shares)         711,225          
March 2013 Financing [Member]                    
Stockholders' Equity (Textual) [Abstract]                    
Term of the warrants in years           5 years 6 months        
Number of common stock issued related to warrants exercised (shares)                 3,138,067  
Over-Allotment Option [Member]                    
Stockholders' Equity (Textual) [Abstract]                    
Stock issued during period (shares)   1,425,000