Stock Incentive Plans - Summary of the Non-vested Options (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014
Options
Options, Granted	339,300
Weighted-average exercise price
Weighted-average exercise price, Granted	$ 5.49
Weighted-average exercise price, Forfeited	$ 17.29
Non-vested Options [Member]
Options
Options, Non-vested, Beginning balance	326,259
Options, Granted	339,300
Options, Vested	(91,940)
Options, Forfeited	(85,703)
Options, Non-vested, Ending balance	487,916
Weighted-average exercise price
Weighted-average exercise price, Beginning balance	$ 14.26
Weighted-average exercise price, Granted	$ 5.49
Weighted-average exercise price, Vested	$ 19.48
Weighted-average exercise price, Forfeited	$ 13.05
Weighted-average exercise price, Ending balance	$ 7.39