Stock options and restricted stock outstanding and exercisable (Detail) (USD $)				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Stock Option Or Restricted Stock Outstanding [Member]	Dec. 31, 2013 Stock Option Or Restricted Stock Outstanding [Member] $0.01-$1.00 [Member]	Dec. 31, 2013 Stock Option Or Restricted Stock Outstanding [Member] $1.01-$2.00 [Member]	Dec. 31, 2013 Stock Option Or Restricted Stock Outstanding [Member] $3.01-$4.00 [Member]	Dec. 31, 2013 Stock Option Or Restricted Stock Outstanding [Member] $4.01-$5.00 [Member]	Dec. 31, 2013 Stock Option Or Restricted Stock Exercisable [Member]	Dec. 31, 2013 Stock Option Or Restricted Stock Exercisable [Member] $0.01-$1.00 [Member]	Dec. 31, 2013 Stock Option Or Restricted Stock Exercisable [Member] $1.01-$2.00 [Member]	Dec. 31, 2013 Stock Option Or Restricted Stock Exercisable [Member] $3.01-$4.00 [Member]	Dec. 31, 2013 Stock Option Or Restricted Stock Exercisable [Member] $4.01-$5.00 [Member]
Outstanding,share	5,884,050	2,302,000	2,228,067	5,884,050	5,747,800	85,000	30,000	21,250
Weighted Avg. remaining contractual life,share outstanding				9 years 3 months 7 days	9 years 5 months 1 day	4 years 3 months 18 days	11 months 16 days	6 months
Weighted Avg. Exercise Price,share outstanding	$ 0.43	$ 1.06	$ 1.14	$ 0.43	$ 0.38	$ 1.44	$ 3.65	$ 4.10
Exercisable, Share	588,750	1,376,950							588,750	452,500	85,000	30,000	21,250
Exercisable, Weighted Avg. Exercise Price	$ 0.89	$ 1.49							$ 0.88	$ 0.45	$ 1.44	$ 3.65	$ 4.10
Aggregate intrinsic value				$ 22,485					$ 0