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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Basic net (loss) income per share:
Net (loss) income applicable to common shares	$ (860)	$ 1,313	$ (3,547)	$ 550
Weighted average common shares outstanding	13,586	12,126	13,280	11,959
Basic net (loss) income per share of common stock	$ (0.06)	$ 0.11	$ (0.27)	$ 0.05
Diluted net (loss) income per share:
Net (loss) income applicable to common shares	$ (860)	$ 1,313	$ (3,547)	$ 550
Weighted average common shares outstanding	13,586	12,126	13,280	11,959
Dilutive effects of stock options		1,906		1,917
Weighted average common shares, assuming dilutive effect of stock options	13,586	14,032	13,280	13,876
Diluted net (loss) income per share of common stock	$ (0.06)	$ 0.09	$ (0.27)	$ 0.04