Net Loss Income Per Share - Reconciliation of Net Loss Income and Weighted Average Shares used in Computing Basic and Diluted Net Loss Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Basic net income per share:
Net income applicable to common shares	$ 1,414	$ 134	$ 525	$ 309
Weighted average common shares outstanding	10,791	11,288	10,834	11,319
Basic net income per share of common stock	$ 0.13	$ 0.01	$ 0.05	$ 0.03
Diluted net income per share:
Net income applicable to common shares	$ 1,414	$ 134	$ 525	$ 309
Weighted average common shares outstanding	10,791	11,288	10,834	11,319
Dilutive effects of stock options	637	548	612	363
Weighted average common shares, assuming dilutive effect of stock options	11,428	11,836	11,447	11,682
Diluted net income per share of common stock	$ 0.12	$ 0.01	$ 0.05	$ 0.03