Net Loss Per Common Share - Calculation of Basic and Diluted Loss Per Common Share and Common Share Equivalents (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Basic net loss per common share
Net loss	$ (1,441)	$ (1,643)
Less: Preferred stock dividends	(7)	(7)
Net loss applicable to common stock	$ (1,448)	$ (1,650)
Basic weighted average number of common shares outstanding	10,803	10,789
Basic net loss per common share	$ (0.13)	$ (0.15)
Diluted loss per common share
Net loss applicable to common stock	$ (1,448)	$ (1,650)
Add: Preferred stock dividends	7	7
Net loss applicable to dilutive common stock	$ (1,441)	$ (1,643)
Basic weighted average number of common shares outstanding	10,803	10,789
Diluted weighted average number of common shares outstanding	10,803	10,789
Diluted net loss per common share	$ (0.13)	$ (0.15)