Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v3.20.1
Subsequent Events - Additional Information (Detail) - USD ($)
 6 Months Ended
Mar. 31, 2020
Mar. 13, 2020
Mar. 01, 2020
Feb. 21, 2020
Jan. 31, 2020
Jan. 18, 2020
Dec. 23, 2019
Dec. 19, 2019
Dec. 13, 2019
Dec. 09, 2019
Dec. 06, 2019
Nov. 30, 2019
Subsequent Event [Line Items]                        
Class of warrants, exercise price                       $ 0.45
Warrants to purchase common shares, shares                       200,000
Proceeds from issuance of common shares                     $ 30.023  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price       265,000   296,986   7,300,000        
Stock option granted, exercise price       $ 1.10                
Maximum [Member]                        
Subsequent Event [Line Items]                        
Stock option granted, exercise price           $ 1.05            
Minimum [Member]                        
Subsequent Event [Line Items]                        
Stock option granted, exercise price           $ 0.85            
Subscription Agreement [Member]                        
Subsequent Event [Line Items]                        
Class of warrants, exercise price                       $ 0.45
Stock issued during period             14,754,098   2,433,333 2,568,330   19,100,333
Term of warrants                       5 years
Warrants to purchase common shares, shares             7,377,049         11,987,250
Purchase price, per share             $ 0.305   $ 0.30 $ 0.30    
Proceeds from issuance of common shares             $ 4,500,000         $ 6,300,000
Subscription Agreement [Member] | Maximum [Member]                        
Subsequent Event [Line Items]                        
Purchase price, per share                       $ 0.40
Subscription Agreement [Member] | Minimum [Member]                        
Subsequent Event [Line Items]                        
Purchase price, per share                       $ 0.30
Securities Purchase Agreement                        
Subsequent Event [Line Items]                        
Initial principal $ 17,100,000                      
Proceeds from issue of debt         $ 15,000,000              
Debt instrument discount amount $ 2,100,000                      
Subsequent Event                        
Subsequent Event [Line Items]                        
Stock issued during period     29,357,527                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price 280,000                      
Stock options with an exercise prices     $ 1.00                  
Stock options with an exercise prices     $ 0.19                  
Proceeds from Stock Options Exercised     $ 7,400,000                  
Subsequent Event | Maximum [Member]                        
Subsequent Event [Line Items]                        
Stock option granted, exercise price $ 1.07                      
Subsequent Event | Minimum [Member]                        
Subsequent Event [Line Items]                        
Stock option granted, exercise price $ 0.96                      
Subsequent Event | Subscription Agreement [Member]                        
Subsequent Event [Line Items]                        
Class of warrants, exercise price   $ 1.00                    
Term of warrants   5 years                    
Warrants to purchase common shares, shares   275,625                    
Purchase price, per share   $ 1,000.00                    
Proceeds from issuance of common shares   $ 900,000