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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Basic Earnings (Loss) per Common Share:
Loss to common shares — basic	$ (7,461)	$ (7,933)	$ (16,369)	$ (16,396)
Weighted average common shares outstanding — basic	12,108	11,665	12,073	11,576
Basic earnings (loss) per common share	$ (0.62)	$ (0.68)	$ (1.36)	$ (1.42)
Diluted Earnings (Loss) per Common Share:
Loss to common shares — diluted	$ (7,461)	$ (7,933)	$ (16,369)	$ (16,396)
Weighted average common shares outstanding — diluted	12,108	11,665	12,073	11,576
Diluted earnings (loss) per common share	$ (0.62)	$ (0.68)	$ (1.36)	$ (1.42)