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Financial Instruments (Details) - USD ($)
3 Months Ended 6 Months Ended
Nov. 16, 2016
Oct. 13, 2016
Sep. 02, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Class of Warrant or Right [Line Items]                
Exercise price of warrants to purchase common stock     $ 2.29          
Fair value of warrant       $ 7,059,262   $ 7,059,262   $ 6,727,409
Increase in fair value of warrant liability       294,356 $ 0 (331,853) $ 0  
Decrease in fair value of warrants           (331,853) $ 0  
Warrants                
Class of Warrant or Right [Line Items]                
Warrants to purchase common stock     4,000,000          
Exercise price of warrants to purchase common stock     $ 1.50          
Exercisable period for warrants (in years)     10 years          
Equity Rights                
Class of Warrant or Right [Line Items]                
Equity offering $ 35,300,000              
Subscription Right | Warrants                
Class of Warrant or Right [Line Items]                
Exercise price of warrants to purchase common stock     $ 1.50          
Common Stock                
Class of Warrant or Right [Line Items]                
Issuance of common stock associated with rights offering, shares 23,523,195              
Warrants                
Class of Warrant or Right [Line Items]                
Fair value of warrant     $ 5,800,000 7,100,000   $ 7,100,000    
Risk free interest rate (as a percent)     1.60%     2.28%    
Expected dividend rate (as a percent)     0.00%     0.00%    
Expected term (in years)     10 years     9 years 2 months 1 day    
Expected volatility rate (as a percent)     80.00%     80.00%    
Increase in fair value of warrant liability       $ (294,356)        
Decrease in fair value of warrants           $ 331,853    
Private Placement                
Class of Warrant or Right [Line Items]                
Payments of stock issuance costs           $ 1,764,240    
Share price $ 2.49              
Common Stock | Subscription Right                
Class of Warrant or Right [Line Items]                
Exercise price of warrants to purchase common stock 1.50              
Amount to be invested by each warrant or right to purchase securities, per share $ 0.65              
Volume of weighted average price during market hours (as a percent) 85.00%              
Common Stock | Private Placement                
Class of Warrant or Right [Line Items]                
Stock issued during period, new issues, shares   708,530            
MacAndrews & Forbes | Common Stock | Private Placement                
Class of Warrant or Right [Line Items]                
Stock issued during period, new issues, shares   565,000