Stock Incentive Plans - Summary of Non-vested Options (Detail)	9 Months Ended
	Sep. 30, 2016 $ / shares shares
Options
Options, Granted | shares	943,620
Weighted-average exercise price
Weighted-average exercise price, Granted	$ 0.63
Weighted-average exercise price, Forfeited	$ 9.61
Non-vested Options [Member]
Options
Options, Non-vested, Beginning balance | shares	1,251,961
Options, Granted | shares	943,620
Options, Vested | shares	(189,800)
Options, Forfeited | shares	(215,065)
Options, Non-vested, Ending balance | shares	1,790,716
Weighted-average exercise price
Weighted-average exercise price, Beginning balance	$ 2.23
Weighted-average exercise price, Granted	0.63
Weighted-average exercise price, Vested	3.77
Weighted-average exercise price, Forfeited	2.63
Weighted-average exercise price, Ending balance	$ 1.18