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Summary of Option Activity (Detail)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
shares
Options Outstanding  
Options outstanding at December 31, 2017 | shares 734,940
Granted | shares 429,678
Exercised | shares (96,196)
Forfeited/cancelled | shares (9,588)
Options outstanding at June 30, 2018 | shares 1,058,834
Options exercisable at June 30, 2018 | shares 448,068
Vested and expected to vest at June 30, 2018 | shares 1,008,777 [1]
Weighted-Average Exercise Price Per Share  
Options outstanding at December 31, 2017 | $ / shares $ 20.80
Granted | $ / shares 34.48
Exercised | $ / shares 15.49
Forfeited/cancelled | $ / shares 29.71
Options outstanding at June 30, 2018 | $ / shares 26.72
Options exercisable at June 30, 2018 | $ / shares 19.14
Vested and expected to vest at June 30, 2018 | $ / shares $ 26.37 [1]
Weighted-Average Remaining Contractual Term (in years)  
Options outstanding at June 30, 2018 7 years 6 months 25 days
Options exercisable at June 30, 2018 5 years 7 months 6 days
Vested and expected to vest at June 30, 2018 7 years 5 months 23 days [1]
Aggregate Intrinsic Value  
Options outstanding at June 30, 2018 | $ $ 21,518
Options exercisable at June 30, 2018 | $ 12,502
Vested and expected to vest at June 30, 2018 | $ $ 20,854 [1]
[1] Represents the number of vested options as of June 30, 2018 plus the number of unvested options expected to vest as of June 30, 2018 based on the unvested outstanding options at June 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.