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Summary of Option Activity (Detail)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Options Outstanding  
Options outstanding at December 31, 2016 | shares 882,748
Granted | shares 101,844
Exercised | shares (201,966)
Forfeited/cancelled | shares (32,957)
Options outstanding at September 30, 2017 | shares 749,669
Options exercisable at September 30, 2017 | shares 423,217
Vested and expected to vest at September 30, 2017 | shares 739,381 [1]
Weighted-Average Exercise Price Per Share  
Options outstanding at December 31, 2016 | $ / shares $ 16.88
Granted | $ / shares 33.38
Exercised | $ / shares 10.08
Forfeited/cancelled | $ / shares 20.31
Options outstanding at September 30, 2017 | $ / shares 20.84
Options exercisable at September 30, 2017 | $ / shares 15.86
Vested and expected to vest at September 30, 2017 | $ / shares $ 20.74 [1]
Weighted-Average Remaining Contractual Term (in years)  
Options outstanding at September 30, 2017 6 years 8 months 19 days
Options exercisable at September 30, 2017 5 years 6 months 10 days
Vested and expected to vest at September 30, 2017 6 years 8 months 12 days [1]
Aggregate Intrinsic Value  
Options outstanding at September 30, 2017 | $ $ 13,205
Options exercisable at September 30, 2017 | $ 9,602
Vested and expected to vest at September 30, 2017 | $ $ 13,065 [1]
[1] Represents the number of vested options as of September 30, 2017 plus the number of unvested options expected to vest as of September 30, 2017 based on the unvested outstanding options at September 30, 2017 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.