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Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share Calculations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Basic shares									6,137,704	6,127,232
Dilutive shares									175,550	83,400
Diluted shares									6,313,254	6,210,632
Net income	$ 441	$ 544	$ 774	$ 836	$ 720	$ 837	$ 1,218	$ 774	$ 2,595	$ 3,549
Basic net income per share	$ 0.07	$ 0.09	$ 0.13	$ 0.14	$ 0.12	$ 0.14	$ 0.20	$ 0.13	$ 0.42	$ 0.58
Diluted net income per share	$ 0.07	$ 0.09	$ 0.12	$ 0.13	$ 0.12	$ 0.13	$ 0.20	$ 0.13	$ 0.41	$ 0.57

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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