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Stockholders' Equity (Details Textual)
 1 Months Ended 6 Months Ended 13 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
plan
$ / shares
shares
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
$ / shares
shares
May 13, 2016
shares
Stockholders' Equity (Textual) [Abstract]          
Maximum authorized amount | $ $ 50,000,000.0        
Agent fee 2.00%        
Stock issued during period (shares)   2,917,725   3,576,473  
Offering price ($ per share) | $ / shares   $ 8.41   $ 8.41  
Proceeds | $   $ 24,060,196 $ 1,301,435 $ 30,400,000  
Remaining authorized amount | $   $ 19,000,000   $ 19,000,000  
Number of plans | plan   1      
Award vesting period   3 years      
Maximum contractual term   10 years      
VGX Equity Compensation Plan [Member]          
Stockholders' Equity (Textual) [Abstract]          
Options outstanding (shares)   348,069   348,069  
2016 Incentive Plan          
Stockholders' Equity (Textual) [Abstract]          
Number of shares authorized (shares)   6,000,000   6,000,000 6,000,000
Number of potential shares authorized for issuance under share based compensation plan (shares)         2,000,000
Number of shares available for grant (shares)   4,074,919   4,074,919  
Number of shares of unvested restricted stock units and options outstanding (shares)   858,915   858,915  
Common stock, other shares, outstanding (shares)   1,063,916   1,063,916  
Stock and Cash Based Incentive Plan [Member]          
Stockholders' Equity (Textual) [Abstract]          
Common stock, other shares, outstanding (shares)   6,476,778   6,476,778  
Number of shares of unvested restricted stock units (shares)   476,829