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	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding, beginning balance	1,684,783
Number of Shares, Granted	31,216
Number of Shares, Exercised	(53,585)
Number of Shares, Cancelled	(189,163)
Number of Shares, Outstanding, ending balance	1,473,251	1,684,783
Number of Shares, Exercisable as of March 31, 2016	845,873
Weighted-Average Exercise Price, Outstanding, beginning balance	$ 17.31
Weighted-Average Exercise Price, Granted	19.37
Weighted-Average Exercise Price, Exercised	2.67
Weighted-Average Exercise Price, Cancelled	30.99
Weighted- Average Exercise Price, Outstanding, ending balance	16.14	$ 17.31
Weighted- Average Exercise Price, Exercisable as of March 31, 2016	$ 13.38
Weighted-Average Remaining Contractual Term, Outstanding, beginning balance	7 years 4 months 24 days	7 years 8 months 12 days
Weighted-Average Remaining Contractual Term, Exercisable as of March 31, 2016	7 years 1 month 6 days
Aggregate Intrinsic Value, Outstanding	$ 10,267	$ 13,965
Aggregate Intrinsic Value, Exercisable as of March 31, 2016	$ 7,178