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Organization and Description of Business - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 18, 2020
Aug. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Subsidiary, Sale of Stock [Line Items]        
Stock issued during period options exercised     1,115,535  
Proceeds from Issuance Initial Public Offering     $ 395,211  
Conversion of Stock, Shares Converted   52,063,647    
Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   138,400    
Deferred Offering Costs     $ 5,400 $ 500
IPO [Member]        
Subsidiary, Sale of Stock [Line Items]        
Stock issued during period 9,735,232      
Stock issued during period options exercised 1,735,232      
Sale of Stock, Price Per Share $ 44.00      
Proceeds from Issuance Initial Public Offering $ 393,200      
Underwriting discounts and commissions 30,000      
Other issuance costs $ 5,100