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Stockholders' Equity - Narrative (Details)
 1 Months Ended 9 Months Ended
Jul. 25, 2017
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
plan
$ / shares
shares
Sep. 30, 2016
USD ($)
May 13, 2016
shares
Class of Stock [Line Items]          
Proceeds | $     $ 94,347,922 $ 5,458,284  
Number of plans | plan     1    
Award vesting period     3 years    
Maximum contractual term     10 years    
VGX Equity Compensation Plan [Member]          
Class of Stock [Line Items]          
Options outstanding (shares)     234,739    
Stock and Cash Based Incentive Plan [Member]          
Class of Stock [Line Items]          
Common stock, other shares, outstanding (shares)     6,448,501    
Number of shares of unvested restricted stock units (shares)     465,495    
2016 Incentive Plan          
Class of Stock [Line Items]          
Number of shares authorized (shares)     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)     3,999,813    
Number of shares of unvested restricted stock units and options outstanding (shares)     858,915    
Common stock, other shares, outstanding (shares)     1,128,147    
Common Stock [Member]          
Class of Stock [Line Items]          
Proceeds | $     $ 24,200,000    
Maximum authorized amount | $   $ 50,000,000.0      
Agent fee   2.00%      
Stock issued during period (shares)     2,937,406    
Offering price (in dollars per share) | $ / shares     $ 8.41    
Aggregate number of shares issued (in shares)     3,596,154    
Aggregate proceeds | $     $ 30,500,000    
Remaining authorized amount | $     $ 18,900,000    
Common Stock [Member] | Public Offering, Not IPO [Member]          
Class of Stock [Line Items]          
Number of common shares sold (in shares) 12,500,000        
Common shares sold (in dollars per share) | $ / shares $ 6.00        
Proceeds | $ $ 70,100,000