Stock Options and Stock Grants - Summary of Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding, Number, Beginning Balance	1,857,000
Shares, Granted	600,000
Stock option exercises , Shares	(23,000)	0
Shares, Forfeited or expired	(340,000)
Outstanding, Number, Ending Balance	2,094,000	1,857,000
Shares, Exercisable	1,096,000
Shares available for grant	980,000
Weighted Average Exercise Price per Share, Beginning Balance	$ 1.69
Weighted Average Exercise Price per Share, Granted	$ 0.42
Weighted Average Exercise Price per Share, Exercised	$ 0.30
Weighted Average Exercise Price per Share, Forfeited or expired	$ 1.80
Weighted Average Exercise Price per Share, Ending Balance	$ 1.30	$ 1.69
Weighted Average Exercise Price per Share, Exercisable	$ 2.06
Weighted Average Remaining Contractual Term, Outstanding	7 years 3 months 18 days
Weighted Average Remaining Contractual Term Years, Exercisable	5 years 10 months 24 days
Aggregate Intrinsic Value, Outstanding	$ 188
Aggregate Intrinsic Value, Exercisable	$ 40