Earnings Per Common Share - Summary of Reconciliation of Earnings (Loss) Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Basic Earnings (Loss) per Common Share:
Net loss	$ (5,198)	$ (4,469)	$ (15,916)	$ (12,631)
Distributed earnings to common shares	0	0	0	0
Distributed earnings to participating securities	0	0	0	0
Total distributed earnings	0	0	0	0
Undistributed loss allocable to common shares	(5,198)	(4,469)	(15,916)	(12,631)
Undistributed earnings allocable to participating securities	0	0	0	0
Total undistributed loss	(5,198)	(4,469)	(15,916)	(12,631)
Loss to common shares—basic	$ (5,198)	$ (4,469)	$ (15,916)	$ (12,631)
Weighted average common shares outstanding—basic	9,506	8,309	8,878	8,101
Basic earnings (loss) per common share	$ (0.55)	$ (0.54)	$ (1.79)	$ (1.56)
Diluted Earnings (Loss) per Common Share:
Loss to common shares—basic	$ (5,198)	$ (4,469)	$ (15,916)	$ (12,631)
Undistributed earnings allocated to participating securities	0	0	0	0
Undistributed earnings reallocated to participating securities	0	0	0	0
Loss to common shares—diluted	$ (5,198)	$ (4,469)	$ (15,916)	$ (12,631)
Weighted average common shares outstanding—basic	9,506	8,309	8,878	8,101
Dilutive effect of stock options	0	0	0	0
Weighted average common shares outstanding—dilutive	9,506	8,309	8,878	8,101
Diluted earnings (loss) per common share	$ (0.55)	$ (0.54)	$ (1.79)	$ (1.56)