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Common Stock - Additional Information (Detail)
$ / shares in Units, $ in Millions
 6 Months Ended
Apr. 09, 2019
Sep. 11, 2018
$ / shares
shares
Aug. 14, 2018
$ / shares
shares
Aug. 08, 2018
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
$ / shares
shares
Class of Warrant or Right [Line Items]            
Warrants term         5 years  
Warrants of common stock exercise price | $ / shares         $ 0.004  
Maximum percentage of stock pertaining to restrictions         24.90%  
Extended term of outstanding warrants expiration period         5 years  
Warrants of common stock expiration date         Sep. 30, 2023  
Common stock, stock split         effected a 2.5-for-1 stock split  
Stock split ratio       2.5    
Common stock, shares authorized       125,000,000 125,000,000 125,000,000
Preferred stock, shares authorized       5,000,000 5,000,000 5,000,000
Stock issued during period, shares, new issues   1,344,500        
Common stock, no par value | $ / shares         $ 0 $ 0
Common stock, warrants issued         0 3,600,953
2018 Equity Incentive Plan [Member]            
Class of Warrant or Right [Line Items]            
Common stock, stock split         2.5-for-1 stock split effected  
Stock split ratio 2.5          
Increase in number of shares authorized for issuance       1,000,000    
IPO [Member]            
Class of Warrant or Right [Line Items]            
Stock issued during period, shares, new issues     9,630,000      
Common stock, no par value | $ / shares          
Shares issued, price per share | $ / shares     $ 12.00      
Gross proceeds of initial public offering | $         $ 124.2  
Net proceeds from initial public offering | $         111.7  
Underwriting discounts and commissions | $         8.7  
Offering costs | $         $ 3.6  
Underwriter Options [Member]            
Class of Warrant or Right [Line Items]            
Common stock, warrants issued     1,444,500      
Purchased Directly From Company [Member]            
Class of Warrant or Right [Line Items]            
Stock issued during period, shares, new issues   723,985        
Purchased Directly From Selling Shareholders [Member]            
Class of Warrant or Right [Line Items]            
Stock issued during period, shares, new issues   620,515        
Firm Shares and Option Shares [Member]            
Class of Warrant or Right [Line Items]            
Shares issued, price per share | $ / shares   $ 12.00