Net Income (Loss) Per Share - Summary of Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Earnings Per Share [Abstract]
Net income (loss)	$ 5,386	$ (867)	$ (18,662)	$ (3,788)	$ (3,561)
Basic weighted average common shares outstanding	30,359,516	18,080,968	22,443,257	18,080,496
Effect of dilutive restricted stock awards	289,911
Effect of dilutive stock options	112,344
Diluted weighted average common shares outstanding	30,761,771	18,080,968	22,443,257	18,080,496
Basic and diluted income (loss) per common share	$ 0.18	$ (0.05)	$ (0.83)	$ (0.21)