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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended 84 Months Ended
Sep. 11, 2018
Aug. 14, 2018
Oct. 17, 2017
Apr. 30, 2019
Aug. 31, 2018
Jul. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2014
Sep. 30, 2020
Apr. 09, 2019
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Stock issued during period, shares, new issues 1,344,500                        
Unrecognized compensation cost related to unvested share-based compensation arrangements             $ 5,100       $ 5,100    
Unrecognized compensation cost, period for recognition             1 year 9 months 18 days            
Share-based compensation expense             $ 4,400 $ 5,500 $ 12,900        
Repurchased shares, value             $ 586 $ 1,872 $ 7,709        
Common Stock [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Stock issued during period, shares, new issues                 10,354,018        
Repurchased shares, shares             142,439 205,235          
Repurchased shares, value             $ 600 $ 1,900          
IPO [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Stock issued during period, shares, new issues   9,630,000                      
Board of Directors [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vesting period             1 year            
Stock Appreciation Rights [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested                 622,238   3,687,218    
Number of shares cancelled                 517,775        
Number of shares unvested                 0       1,140,013
Number of shares granted                 0   4,204,993    
Number of shares authorized                   5,000,000      
Shares vesting period                   3 years      
Shares expiration period                   10 years      
Number of shares exercised                     2,088,333    
Restricted Stock Units [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested                     44,623    
Number of shares granted                     536,538    
Number of shares authorized     1,250,000                    
Shares vesting period     3 years                    
Restricted Stock Units [Member] | Minimum [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vesting period             3 years            
Restricted Stock Units [Member] | Maximum [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vesting period             5 years            
Restricted Stock Award | Minimum [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vesting period             3 years            
Restricted Stock Award | Maximum [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vesting period             5 years            
2018 Equity Incentive Plan [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares authorized                       3,500,000  
2018 Equity Incentive Plan [Member] | Restricted Stock [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested       2,255,577     555,473 701,582 32,500        
Stock issued during period, shares, new issues           2,249,147              
Number of shares cancelled       30,245 966,022 491,915 7,250 22,995 0        
Unvested restricted shares issued           491,198              
Number of shares unvested             1,195,548 847,974 1,250,625   1,195,548   0
Number of shares granted   1,266,034   3,481,370     910,297 321,926          
2018 Equity Incentive Plan [Member] | Restricted Stock [Member] | Minimum [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares authorized       2,500,000                  
2018 Equity Incentive Plan [Member] | Restricted Stock [Member] | Maximum [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares authorized       3,500,000                  
2018 Equity Incentive Plan [Member] | Stock Appreciation Rights [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested         1,598,885 966,022              
Stock issued during period, shares, new issues           1,266,034              
Number of shares cancelled         300,012                
Number of shares unvested           300,012              
2018 Equity Incentive Plan [Member] | Stock Appreciation Rights [Member] | IPO [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Unvested restricted shares issued         517,775                
2018 Equity Incentive Plan [Member] | Restricted Stock Units [Member] | IPO [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares cancelled         491,915                
2011 Plan [Member] | Restricted Stock [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested           1,978,550              
Number of shares cancelled           470,355              
Number of shares granted           2,448,905              
2017 Plan [Member] | Restricted Stock [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested           10,412              
Number of shares cancelled           20,843              
Number of shares granted           31,255