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Summary of Option Activity (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Options Outstanding  
Options outstanding at December 31, 2019 | shares 957,559
Granted | shares 79,698
Exercised | shares (340,546)
Options outstanding at December 31, 2020 | shares 696,711
Options exercisable at December 31, 2020 | shares 311,988
Vested and expected to vest at December 31, 2020 | shares 667,220 [1]
Weighted-Average Exercise Price Per Share  
Options outstanding at December 31, 2019 | $ / shares $ 30.81
Granted | $ / shares 115.81
Exercised | $ / shares 23.95
Options outstanding at December 31, 2020 | $ / shares 43.88
Options exercisable at December 31, 2020 | $ / shares $ 31.75
Weighted-Average Remaining Contractual Term (in years)  
Options outstanding at December 31, 2020 6 years 10 months 24 days
Options exercisable at December 31, 2020 5 years 10 months 28 days
Vested and expected to vest at December 31, 2020 6 years 10 months 9 days [1]
Aggregate Intrinsic Value  
Options outstanding at December 31, 2020 | $ $ 102,958
Options exercisable at December 31, 2020 | $ 49,879
Vested and expectd to vest at December 31, 2020 | $ $ 99,096 [1]
[1] Represents the number of vested options as of December 31, 2020 plus the number of unvested options expected to vest as of December 31, 2020 based on the unvested outstanding options at December 31, 2020 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.