The dilutive potential common shares are summarized as follows (Details)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
The dilutive potential common shares are summarized as follows
Stock options outstanding	4,703,326	1,986,255	1,948,997
Restricted stock outstanding	650,002	0	280,771
Common stock warrants (1)	24,137,878	9,421,008	7,128,563
Preferred stock (2)	10,972,859	0	0
Number of dilutive potential common shares	40,464,065	11,407,263	9,358,331