Stock-Based Compensation Arrangements (Employee Stock Purchase Plan) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Shares
Outstanding, beginning of period	5,884,050	2,302,000
Stock options granted	125,000	200,000
Stock options exercised	0	(2,000)
Restricted stock exercised	0	(2,500)
Canceled/Expired	(17,250)	(62,000)
Outstanding, end of period	5,991,800	2,435,500
Exercisable, end of period	660,725	1,371,725
Weighted Avg Exercise Price
Outstanding, beginning of period	$ 0.43	$ 1.06
Granted	$ 0.35	$ 0.29
Exercised	$ 0.00	$ 0.12
Restricted stock exercised	$ 0.00	$ 0.00
Canceled/Expired	$ 4.10	$ 1.89
Outstanding, end of period	$ 0.42	$ 0.98
Exercisable, end of period	$ 0.72	$ 1.43