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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Basic net income per share:
Net income applicable to common shares	$ 1,772	$ 793	$ 2,297	$ 1,102
Weighted average common shares outstanding	10,732	11,137	10,800	11,258
Basic net income per share of common stock	$ 0.17	$ 0.07	$ 0.21	$ 0.10
Diluted net income per share:
Net income applicable to common shares	$ 1,772	$ 793	$ 2,297	$ 1,102
Weighted average common shares outstanding	10,732	11,137	10,800	11,258
Dilutive effects of stock options	1,501	540	985	422
Weighted average common shares, assuming dilutive effect of stock options	12,233	11,677	11,785	11,680
Diluted net income per share of common stock	$ 0.14	$ 0.07	$ 0.19	$ 0.10