Stock-Based Compensation Arrangements (Employee Stock Purchase Plan) (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Shares
Outstanding, beginning of period	5,884,050	2,302,000
Stock options granted	137,000	200,000
Stock options exercised		(2,000)
Restricted stock exercised		(2,500)
Canceled/Expired	(31,250)	(80,250)
Outstanding, end of period	5,989,800	2,417,250
Exercisable, end of period	711,175	1,443,075
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	$ 2.43	$ 1.58
Outstanding, end of period	$ 0.42	$ 0.98
Exercisable, end of period	$ 0.72	$ 1.40