Stockholders' Equity - Summary of Stock Option Activity Under the 2010 Stock Plan and the 2013 Stock Plan (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding, beginning balance			1,267,329
Number of Shares, Granted	0	0	0
Number of Shares, Exercised			(239,836)
Number of Shares, Cancelled			(14,660)
Number of Shares, Outstanding, ending balance	1,012,833		1,012,833	1,267,329
Number of Shares, Exercisable as of June 30, 2017	840,484		840,484
Weighted-Average Exercise Price, Outstanding, beginning balance			$ 16.22
Weighted-Average Exercise Price, Exercised			9.12
Weighted-Average Exercise Price, Cancelled			24.34
Weighted- Average Exercise Price, Outstanding, ending balance	$ 17.79		17.79	$ 16.22
Weighted-Average Exercise Price, Exercisable as of June 30, 2017	$ 15.98		$ 15.98
Weighted-Average Remaining Contractual Term, Outstanding			6 years 2 months 12 days	6 years 7 months 6 days
Weighted-Average Remaining Contractual Term, Exercisable as of June 30, 2017			6 years 1 month 6 days
Aggregate Intrinsic Value, Outstanding	$ 22,795		$ 22,795	$ 8,355
Aggregate Intrinsic Value, Exercisable as of June 30, 2017	$ 20,294		$ 20,294