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Summary of Option Activity (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Options Outstanding  
Options outstanding at December 31, 2017 | shares 734,940
Granted | shares 449,678
Exercised | shares (176,804)
Forfeited/expired/cancelled | shares (9,588)
Options outstanding at December 31, 2018 | shares 998,226
Options exercisable at December 31, 2018 | shares 410,760
Vested and expected to vest at December 31, 2018 | shares 953,454 [1]
Weighted-Average Exercise Price Per Share  
Options outstanding at December 31, 2017 | $ / shares $ 20.80
Granted | $ / shares 35.48
Exercised | $ / shares 19.31
Forfeited/expired/cancelled | $ / shares 29.71
Options outstanding at December 31, 2018 | $ / shares 27.54
Options exercisable at December 31, 2018 | $ / shares 18.53
Vested and expected to vest at December 31, 2018 | $ / shares [1]
Weighted-Average Remaining Contractual Term (in years)  
Options outstanding at December 31, 2018 7 years 2 months 8 days
Options exercisable at December 31, 2018 4 years 11 months 15 days
Vested and expected to vest at December 31, 2018 7 years 1 month 6 days [1]
Aggregate Intrinsic Value  
Options outstanding at December 31, 2018 | $ $ 25,273
Options exercisable at December 31, 2018 | $ 14,051
Vested and expected to vest at December 31, 2018 | $ $ 24,490 [1]
[1] Represents the number of vested options as of December 31, 2018 plus the number of unvested options expected to vest as of December 31, 2018 based on the unvested outstanding options at December 31, 2018 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.