Cash Proceeds Along with Fair Value Disclosures Related to grants Exercises and Vesting Options (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Schedule Of Cash Proceeds And Weighted Average Fair Values Of Stock Options [Line Items]
Proceeds from stock options exercised	$ 76		$ 277
Tax benefit related to stock options exercised		[1]		[1]
Intrinsic value of stock options exercised	23	[2]	11	[2]
Weighted-average fair value of options granted during period	$ 1.84		$ 1.99
Total fair value of shares vested during the period	$ 314		$ 557

[1] Excess tax benefits received related to stock option exercises are presented as financing cash inflows. We currently do not receive a tax benefit related to the exercise of stock options due to our net operating losses.

[2] The intrinsic value of stock options exercised is the amount by which the market price of the stock on the date of exercise exceeded the market price of the stock on the date of grant.