Net (Loss) Income Per Share - Reconciliation of Net Income and Weighted Average Shares used in Computing Basic and Diluted Net (Loss) Income 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
Basic net (loss) income per share:
Net (loss) income applicable to common shares	$ (172)	$ 43	$ (3,719)	$ 593
Weighted average common shares outstanding	13,924	12,253	13,497	12,057
Basic net (loss) income per share of common stock	$ (0.01)	$ 0.00	$ (0.28)	$ 0.05
Diluted net (loss) income per share:
Net (loss) income applicable to common shares	$ (172)	$ 43	$ (3,719)	$ 593
Weighted average common shares outstanding	13,924	12,253	13,497	12,057
Dilutive effects of stock options		1,837		2,023
Weighted average common shares, assuming dilutive effect of stock options	13,924	14,090	13,497	14,080
Diluted net (loss) income per share of common stock	$ (0.01)	$ 0.00	$ (0.28)	$ 0.04