Non-vested options (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Non-vested options, beginning of year, Shares	925,050	1,128,250
Non-vested options, beginning of year,Weighted Avg Exercise Price	$ 0.42	$ 0.57
Granted, Shares	4,693,800	581,000
Granted, Weighted Avg Exercise Price	$ 0.38	$ 0.36
Vested, Shares	(270,300)	(367,600)
Vested, Weighted Avg Exercise Price	$ 0.48	$ 0.65
Forfeited, Shares	(53,250)	(416,600)
Forfeited, Weighted Avg Exercise Price	$ 0.51	$ 0.52
Non-vested options, end of year, Shares	5,295,300	925,050
Non-vested options, end of year, Weighted Avg Exercise Price	$ 0.38	$ 0.42