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Summary of Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Options Outstanding    
Options outstanding at December 31, 2020 | shares 696,711  
Granted | shares 38,824  
Exercised | shares (70,935)  
Forfeited/expired/cancelled (6,000)  
Options outstanding at September 30, 2021 | shares 658,600 696,711
Options exercisable at September 30, 2021 | shares 343,909  
Vested and expected to vest at September 30, 2021(1) | shares [1] 637,504  
Weighted-Average Exercise Price Per Share    
Options outstanding at December 31, 2020 $ 43.88  
Granted 202.88  
Exercised 28.00  
Forfeited/expired/cancelled 48.05  
Options outstanding at September 30, 2021 54.93 $ 43.88
Options exercisable at September 30, 2021 $ 38.68  
Weighted-Average Remaining Contractual Term (in years)    
Options outstanding 6 years 6 months 18 days 6 years 10 months 24 days
Options exercisable at September 30, 2021 5 years 10 months 13 days  
Vested and expected to vest at September 30, 2021 [1] 6 years 6 months 10 days  
Aggregate Intrinsic Value    
Options outstanding $ 154,152 $ 102,958
Options exercisable at September 30, 2021 86,085  
Vested and expected to vest at September 30, 2021 [1] $ 149,348  
[1] Represents the number of vested options as of September 30, 2021 plus the number of unvested options expected to vest as of September 30, 2021 based on the unvested outstanding options at September 30, 2021 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.