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Summary of Option Activity (Detail)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Options Outstanding  
Options outstanding at December 31, 2019 | shares 957,559
Granted | shares 57,698
Exercised | shares (246,353)
Options outstanding at June 30, 2020 | shares 768,904
Options exercisable at June 30, 2020 | shares 392,181
Vested and expected to vest at June 30, 2020(1) | shares 738,412 [1]
Weighted-Average Exercise Price Per Share  
Options outstanding at December 31, 2019 | $ / shares $ 30.81
Granted | $ / shares 100.53
Exercised | $ / shares 21.97
Options outstanding at June 30, 2020 | $ / shares 38.87
Options exercisable at June 30, 2020 | $ / shares $ 30.64
Weighted-Average Remaining Contractual Term (in years)  
Options outstanding at June 30, 2020 7 years 1 month 20 days
Options exercisable at June 30, 2020 6 years 3 months 3 days
Vested and expected to vest at June 30, 2020 7 years 1 month 6 days [1]
Aggregate Intrinsic Value  
Options outstanding at June 30, 2020 | $ $ 65,243
Options exercisable at June 30, 2020 | $ 36,463
Vested and expectd to vest at June 30, 2020 | $ $ 62,833 [1]
[1] Represents the number of vested options as of June 30, 2020 plus the number of unvested options expected to vest as of June 30, 2020 based on the unvested outstanding options at June 30, 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.