Summary of Significant Accounting Policies - Calculation of Basic and Diluted Net Income (Loss) Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Basic:
Net income (loss)	$ 66	$ (612)
Weighted average common shares, basic	23,908	22,564
Basic net income (loss) per share	$ 0.00	$ (0.03)
Diluted:
Net income (loss)	$ 66	$ (612)
Weighted average common shares, basic	23,908	22,564
Dilutive effect of:
Options to purchase common stock	569
Nonvested shares of restricted stock	22
Weighted average common shares, diluted	24,499	22,564
Diluted net income (loss) per share	$ 0.00	$ (0.03)