Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Granted	774,000	884,000	0
2014 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Outstanding at December 31, 2014	1,022,360
Number of Options, Granted	774,000
Number of Options, Exercised	(124,868)
Number of Options, Expired	(8,000)
Number of Options, Forfeited	(5,084)
Number of Options, Outstanding at December 31, 2015	1,658,408	1,022,360
Number of Options, Outstanding, Weighted average remaining contractual life as of December 31, 2015	8 years 3 months 22 days
Number of Options, Options exercisable at December 31, 2015	510,298
Number of Options, Exercisable, Weighted average remaining contractual life as of December 31, 2015	6 years 7 months 2 days
Number of Options, Options vested and expected to vest at December 31, 2015	1,574,746
Number of Options, Vested and expected to vest, Weighted average remaining contractual life as of December 31, 2015	8 years 3 months 4 days
Weighted-Average Exercise Price, Outstanding at December 31, 2014	$ 8.16
Weighted-Average Exercise Price, Granted	11.77
Weighted-Average Exercise Price, Exercised	2.89
Weighted-Average Exercise Price, Expired	0.25
Weighted-Average Exercise Price, Forfeited	10.45
Weighted-Average Exercise Price, Outstanding at December 31, 2015	10.27	$ 8.16
Weighted-Average Exercise Price, Options exercisable at December 31, 2015	7.78
Weighted-Average Exercise Price, Options vested and expected to vest at December 31, 2015	$ 10.14
Aggregate Intrinsic Value, Outstanding at December 31, 2015	$ 11,058
Aggregate Intrinsic Value, Options exercisable at December 31, 2015	4,634
Aggregate Intrinsic Value, Options vested and expected to vest at December 31, 2015	$ 10,693