Net Income (Loss) Per Share - Reconciliation of Net Income and Weighted Average Shares used in Computing Basic and Diluted Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Basic net income (loss) per share:
Net income (loss) applicable to common shares	$ 1,313	$ 494	$ 550	$ (446)
Weighted average common shares outstanding	12,126	11,473	11,959	11,410
Basic net income (loss) per share of common stock	$ 0.11	$ 0.04	$ 0.05	$ (0.04)
Diluted net income (loss) per share:
Net income (loss) applicable to common shares	$ 1,313	$ 494	$ 550	$ (446)
Weighted average common shares outstanding	12,126	11,473	11,959	11,410
Dilutive effects of stock options	1,906	1,757	1,917
Weighted average common shares, assuming dilutive effect of stock options	14,032	13,230	13,876	11,410
Diluted net income (loss) per share of common stock	$ 0.09	$ 0.04	$ 0.04	$ (0.04)