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Warrant Liability (Details 4) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Summary of outstanding warrants and fair value of warrant liability
Number Outstanding	9,601,378
Fair value	$ 9,035,131
Series A Warrants [Member]
Summary of outstanding warrants and fair value of warrant liability
Number Outstanding	8,166,895	8,501,429
Exercise Price per share	$ 1.40
Fair value	8,952,059
Warrants issued in 2008 [Member]
Summary of outstanding warrants and fair value of warrant liability
Number Outstanding	1,034,483
Exercise Price per share	$ 23.00
Fair value	14,752
Warrants issued in 2009 [Member]
Summary of outstanding warrants and fair value of warrant liability
Number Outstanding	400,000
Exercise Price per share	$ 15.00
Fair value	$ 68,320