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Subsequent Events (Details) - USD ($)
1 Months Ended 9 Months Ended
Nov. 08, 2018
Sep. 30, 2018
Sep. 30, 2017
Subsequent Event [Line Items]      
Proceeds from issuance of common stock, net of issuance costs   $ 14,923,263 $ 94,347,922
Common Stock | Sales Agreement      
Subsequent Event [Line Items]      
Proceeds from issuance of common stock, net of issuance costs   $ 14,900,000  
Common shares sold (dollars per share)   $ 5.14  
Common Stock | Sales Agreement | Subsequent Event      
Subsequent Event [Line Items]      
Number of common shares sold (shares) 1,059,591    
Proceeds from issuance of common stock, net of issuance costs $ 5,700,000    
Common shares sold (dollars per share) $ 5.49