Employee Stock Purchase Plan (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Shares
Outstanding, beginning of period	2,302,000	2,228,067
Granted	4,693,800	581,000
Stock options exercised	(252,000)	0
Restricted stock exercised	(2,500)	(2,500)
Forfeited/Expired	(857,250)	(504,567)
Outstanding, end of period	5,884,050	2,302,000
Exercisable, end of period	588,750	1,376,950
Weighted Avg Exercise Price
Outstanding, beginning of period	$ 1.06	$ 1.14
Granted	$ 0.38	$ 0.36
Exercised	$ 0.32	$ 0
Restricted stock exercised	$ 0.00	$ 0.00
Canceled/Expired	$ 1.87	$ 0.60
Outstanding, end of period	$ 0.43	$ 1.06
Exercisable, end of period	$ 0.89	$ 1.49