Net Income Per Share - Reconciliation of Net Income and Weighted Average Shares used in Computing Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Basic net income per share:
Net income applicable to common shares	$ 1,027	$ 976	$ 581	$ 3,408
Weighted average common shares outstanding	11,568	11,197	11,463	11,092
Basic net income per share of common stock	$ 0.09	$ 0.09	$ 0.05	$ 0.31
Diluted net income per share:
Net income applicable to common shares	$ 1,027	$ 976	$ 581	$ 3,408
Weighted average common shares outstanding	11,568	11,197	11,463	11,092
Dilutive effects of stock options	1,707	1,775	1,809	1,881
Weighted average common shares, assuming dilutive effect of stock options	13,275	12,972	13,272	12,973
Diluted net income per share of common stock	$ 0.08	$ 0.08	$ 0.04	$ 0.26