Earnings per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net income (loss) from continuing operations	$ 719	$ 89	$ 720	$ (8,229)
Net income (loss) from discontinued operations	236	86	(148)	(4,125)
Net income (loss)	$ 955	$ 175	$ 572	$ (12,354)
Denominator:
Common shares outstanding	16,757	16,106	16,526	16,136
Earnings per common share - basic
Net income (loss) from continuing operations	$ 0.04	$ 0.01	$ 0.04	$ (0.51)
Net income (loss) from discontinued operations	0.01	0.01	(0.01)	(0.26)
Net income (loss)	$ 0.06	$ 0.01	$ 0.03	$ (0.77)
Denominator:
Common shares outstanding	16,757	16,106	16,526	16,136
Common stock option grants	4	0	2
Total shares	17,065	16,245	16,830	16,136
Earnings per common share - diluted
Net income (loss) from continuing operations	$ 0.04	$ 0.01	$ 0.04	$ (0.51)
Net income (loss) from discontinued operations	0.01	0.01	(0.01)	(0.26)
Net income (loss)	$ 0.06	$ 0.01	$ 0.03	$ (0.77)
Restricted Stock [Member]
Denominator:
Shares subject to vesting	304	139	302