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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Basic net income per share:
Net income applicable to common shares	$ 43	$ 1,027	$ 593	$ 581
Weighted average common shares outstanding	12,253	11,568	12,057	11,463
Basic net income per share of common stock	$ 0.00	$ 0.09	$ 0.05	$ 0.05
Diluted net income per share:
Net income applicable to common shares	$ 43	$ 1,027	$ 593	$ 581
Weighted average common shares outstanding	12,253	11,568	12,057	11,463
Dilutive effects of stock options	1,837	1,707	2,023	1,809
Weighted average common shares, assuming dilutive effect of stock options	14,090	13,275	14,080	13,272
Diluted net income per share of common stock	$ 0.00	$ 0.08	$ 0.04	$ 0.04