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Share-Based Compensation - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Mar. 24, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Shares granted         506,500    
Share-based compensation tax benefits   $ 200,000 $ 100,000   $ 500,000 $ 500,000  
Share-based compensation         2,705,000 $ 16,906,000  
Pretax unrecognized compensation expense         $ 13,400,000    
Forfeiture rate utilized for estimating forfeitures of options and restricted share units granted.         5.00%    
Share options contractual term         10 years    
Aggregate intrinsic value of options exercisable   3,416,065     $ 3,416,065    
Share options exercised, shares         13,594    
Unrecognized pre-tax share based compensation expense related to unvested share option awards   11,200,000     $ 11,200,000    
Shares vested         18,055    
Unrecognized pre-tax compensation expense related to unvested share awards   $ 2,200,000     $ 2,200,000    
Employee Share Purchase Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of shares authorized             256,730
Number of outstanding shares added annually 275,000            
Percentage of outstanding shares 1.00%            
Total number of shares available under ESPP 550,000            
Percentage of purchase price shares on first trading day of each offering period or on the purchase date 85.00%            
Recapitalization Awards              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Share-based compensation       $ 15,400,000      
2019 Share Incentive Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of shares authorized   1,283,649     1,283,649   1,283,649
Shares granted         506,500    
Percentage of outstanding shares 5.00%            
2019 Share Incentive Plan | Maximum              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of outstanding shares added annually 1,320,000            
2019 Share Incentive Plan | IPO              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of shares authorized 3,400,000     3,400,000      
2019 Share Incentive Plan | RSAs and RSUs | IPO              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Shares granted 240,037            
2019 Share Incentive Plan | Recapitalization Awards | IPO              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Share price $ 12.00     $ 12.00      
2019 Share Incentive Plan | Restricted Stock Units (RSUs)              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Shares granted         506,500    
Shares vested         18,055    
Shares to pay emloyees' portion of minimum payroll withholding taxes         3,889