Summary of Option Activity (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Options Outstanding
Options outstanding at December 31, 2015 | shares	1,054,584
Granted | shares	183,619
Exercised | shares	(266,863)
Forfeited/cancelled | shares	(88,592)
Options outstanding at December 31, 2016 | shares	882,748
Options exercisable at December 31, 2016 | shares	427,310
Vested and expected to vest at December 31, 2016 | shares	837,660	[1]
Weighted-Average Exercise Price Per Share
Options outstanding at December 31, 2015 | $ / shares	$ 12.28
Granted | $ / shares	27.12
Exercised | $ / shares	7.72
Forfeited/cancelled | $ / shares	10.97
Options outstanding at December 31, 2016 | $ / shares	16.88
Options exercisable at December 31, 2016 | $ / shares	11.11
Vested and expected to vest at December 31, 2016 | $ / shares	$ 16.82	[1]
Weighted-Average Remaining Contractual Term (in years)
Options outstanding at December 31, 2016	6 years 9 months
Options exercisable at December 31, 2016	5 years 2 months 23 days
Vested and expected to vest at December 31, 2016	6 years 8 months 12 days	[1]
Aggregate Intrinsic Value
Options outstanding at December 31, 2016 | $	$ 12,733
Options exercisable at December 31, 2016 | $	8,617
Vested and expected to vest at December 31, 2016 | $	$ 12,140	[1]

[1] Represents the number of vested options as of December 31, 2016 plus the number of unvested options expected to vest as of December 31, 2016 based on the unvested outstanding options at December 31, 2016 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.