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Summary of Option Activity (Detail)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Options Outstanding  
Options outstanding at December 31, 2017 | shares 734,940
Granted | shares 439,678
Exercised | shares (131,718)
Forfeited/cancelled | shares (9,588)
Options outstanding at September 30, 2018 | shares 1,033,312
Options exercisable at September 30, 2018 | shares 444,446
Vested and expected to vest at September 30, 2018 | shares 986,509 [1]
Weighted-Average Exercise Price Per Share  
Options outstanding at December 31, 2017 | $ / shares $ 20.80
Granted | $ / shares 34.79
Exercised | $ / shares 18.02
Forfeited/cancelled | $ / shares 29.71
Options outstanding at September 30, 2018 | $ / shares 26.99
Options exercisable at September 30, 2018 | $ / shares 18.73
Vested and expected to vest at September 30, 2018 | $ / shares $ 26.64 [1]
Weighted-Average Remaining Contractual Term (in years)  
Options outstanding at September 30, 2018 7 years 4 months 17 days
Options exercisable at September 30, 2018 5 years 3 months 14 days
Vested and expected to vest at September 30, 2018 7 years 3 months 14 days [1]
Aggregate Intrinsic Value  
Options outstanding at September 30, 2018 | $ $ 29,421
Options exercisable at September 30, 2018 | $ 16,325
Vested and expected to vest at September 30, 2018 | $ $ 28,429 [1]
[1] Represents the number of vested options as of September 30, 2018 plus the number of unvested options expected to vest as of September 30, 2018 based on the unvested outstanding options at September 30, 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.