Stock Incentive Plans - Summary of Non-vested Options (Detail)	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Options
Options, Granted | shares	458,600
Weighted-average exercise price
Weighted-average exercise price, Granted	$ 1.85
Weighted-average exercise price, Forfeited	$ 11.02
Non-vested Options [Member]
Options
Options, Non-vested, Beginning balance | shares	628,733
Options, Granted | shares	458,600
Options, Vested | shares	(109,460)
Options, Forfeited | shares	(120,219)
Options, Non-vested, Ending balance | shares	857,654
Weighted-average exercise price
Weighted-average exercise price, Beginning balance	$ 5.93
Weighted-average exercise price, Granted	1.85
Weighted-average exercise price, Vested	6.73
Weighted-average exercise price, Forfeited	6.53
Weighted-average exercise price, Ending balance	$ 3.56