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Stockholders' Equity - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Nov. 30, 2017
Class of Stock [Line Items]        
Fair value of warrants $ 8,344,000   $ 17,613,000  
Aggregate value of securities available under shelf registration statement 144,300,000      
Warrants exercised for common stock 440,043      
Proceeds from warrant exercised   $ 1,118,000    
Common stock Value Issued $ 159,000      
Common Stock, Share Subscribed but Unissued, Subscriptions Receivable     $ 5,274,000  
Warrant [Member]        
Class of Stock [Line Items]        
Warrants outstanding 16,061,602      
Exercise price $ 2.54      
ATM Sales Agreement        
Class of Stock [Line Items]        
Common stock share issued 63,684   2,214,658  
Common stock Value Issued $ 200,000   $ 5,400,000  
Maximum        
Class of Stock [Line Items]        
Sale of shares and warrants under agreement $ 150,000,000      
Maximum | ATM Sales Agreement        
Class of Stock [Line Items]        
Sale of shares under agreement       $ 30,000,000