Calculations of Basic and Diluted Loss per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share Disclosure [Line Items]
Net loss - basic and diluted	$ (1,331)	$ (4,288)
Weighted-average shares outstanding - basic and diluted	14,396	13,963
Basic and diluted loss per common share	$ (0.09)	$ (0.31)