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Equity-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Common stock shares outstanding 47,378,041   47,378,041   47,248,685
Aggregate Intrinsic Value, Exercisable $ 33,742   $ 33,742    
Equity based compensation expense 6,701 $ 2,129 $ 16,972 $ 4,595  
Weighted Average Remaining Contractual Term, Outstanding     8 years 6 months   9 years 1 month 6 days
Number of Shares, Granted     1,363,220    
Restricted Stock Units [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Weighted-average grant date fair value     $ 35.15 $ 44.02  
Equity based compensation expense     $ 22,200    
Weighted Average Remaining Contractual Term, Outstanding     2 years 10 months 24 days    
Number of Shares, Granted     772,760    
Aggregate fair value of restricted common stock vested     $ 500    
Restricted Common Stock [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Equity based compensation expense     $ 100    
Weighted Average Remaining Contractual Term, Outstanding     1 year    
Aggregate fair value of restricted common stock vested     $ 300 $ 200  
Stock Option [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Weighted-average grant date fair value     $ 23.45 $ 6.62  
Aggregate Intrinsic Value, Exercisable $ 2,800   $ 2,800    
Equity based compensation expense     $ 42,700    
Weighted Average Remaining Contractual Term, Outstanding     2 years 7 months 6 days    
2020 Stock Option And Incentive Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Common stock shares outstanding 1,892,009   1,892,009    
Annual increase common stock issuance     2,381,767    
2020 Employee stock purchase plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Common stock shares outstanding 840,032   840,032    
Annual increase common stock issuance     472,487    
Shares issued under ESPP     0