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Summary of Option Activity (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Options Outstanding  
Options outstanding at December 31, 2018 | shares 998,226
Granted | shares 54,996
Exercised | shares (87,663)
Forfeited/expired/cancelled (8,000)
Options outstanding at December 31, 2019 | shares 957,559
Options exercisable at December 31, 2019 | shares 513,577
Vested and expected to vest at December 31, 2019 | shares 923,355 [1]
Weighted-Average Exercise Price Per Share  
Options outstanding at December 31, 2018 | $ / shares $ 27.54
Granted | $ / shares 64.14
Exercised | $ / shares 13.30
Forfeited/expired/cancelled | $ / shares 43.60
Options outstanding at December 31, 2019 | $ / shares 30.81
Options exercisable at December 31, 2019 | $ / shares $ 24.44
Weighted-Average Remaining Contractual Term (in years)  
Options outstanding at December 31, 2019 6 years 8 months 8 days
Options exercisable at December 31, 2019 5 years 4 months 20 days
Vested and expected to vest at December 31, 2019 6 years 7 months 17 days [1]
Aggregate Intrinsic Value  
Options outstanding at December 31, 2019 | $ $ 59,073
Options exercisable at December 31, 2019 | $ 34,954
Vested and expectd to vest at December 31, 2019 | $ $ 57,235 [1]
[1] Represents the number of vested options as of December 31, 2019 plus the number of unvested options expected to vest as of December 31, 2019 based on the unvested outstanding options at December 31, 2019 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.