Stock-Based Compensation - Summary of Company's Stock Option Plans (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of Options, Outstanding at beginning of year	445,684
Number of Options, Granted	630,000
Number of Options, Exercised	(15,625)
Number of Options, Forfeited	(40,375)
Number of Options, Outstanding at end of year	1,019,684	445,684
Number of Options, Vested	319,429
Number of Options, Unvested	700,255
Number of Options, Vested or expected to vest, December 31, 2015	1,019,684
Number of Options, Exercisable, December 31, 2015	319,429
Weighted-Average Exercise Price, Outstanding at beginning of year	$ 8.28
Weighted-Average Exercise Price, Granted	6.80
Weighted-Average Exercise Price, Exercised	5.28
Weighted-Average Exercise Price, Forfeited	11.18
Weighted-Average Exercise Price, Outstanding at end of year	7.30	$ 8.28
Weighted-Average Exercise Price, Vested	8.30
Weighted-Average Exercise Price, Unvested	6.84
Weighted-Average Exercise Price, Vested or expected to vest, December 31, 2015	7.30
Weighted-Average Exercise Price, Exercisable, December 31, 2015	$ 8.30
Weighted-Average Remaining Contractual Life, Outstanding	46 years	5 years 1 month 10 days
Weighted-Average Remaining Contractual Life, Vested	4 years 3 months 29 days
Weighted-Average Remaining Contractual Life, Vested or expected to vest, December 31, 2015	5 years 5 months 16 days
Weighted-Average Remaining Contractual Life, Exercisable, December 31, 2015	4 years 3 months 29 days
Aggregate Intrinsic Value, Outstanding	$ 45,625
Aggregate Intrinsic Value, Exercised	21,436	$ 10,161	$ 4,380
Aggregate Intrinsic Value, Outstanding	3,607,077	$ 45,625
Aggregate Intrinsic Value, Vested	1,060,969
Aggregate Intrinsic Value, Unvested	2,546,108
Aggregate Intrinsic Value, Vested or expected to vest, December 31, 2015	3,607,077
Aggregate Intrinsic Value, Exercisable, December 31, 2015	$ 1,060,969