Organization and Basis of Presentation (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Organization and Basis of Presentation (Textual) [Abstract]
Proceeds from issue of common stock through ATM program	$ 20,000,000,000
Total cash and cash equivalents	$ 17,211,098	$ 27,996,871	$ 20,942,709	$ 30,520,812