Shareholders' Equity (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of carrying value of warrant liability
Beginning Balance, January 1	$ 2,852,880	$ 2,157,408	$ 2,581,871
Issuance of warrants and effect of repricing		397,294
Exercise of warrants	(1,145,659)	(1,981,745)	2,476,790
(Gain) or loss included in earnings	(642,411)	2,279,923	(2,901,253)
Transfers in and/or out of Level 3
Ending Balance, December 31	$ 1,064,810	$ 2,852,880	$ 2,157,408