Net Loss Per Common Share (Reconciliation of Net Loss Per Share) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Numerator:
Net loss	$ (5,524,324)	$ (8,980,346)	$ (11,287,356)	$ (16,312,944)
Preferred stock dividends	(1,029,735)	(1,102,398)	(2,064,042)	(2,208,275)
NET LOSS AVAILABLE TO COMMON SHAREHOLDERS	$ (6,554,059)	$ (10,082,744)	$ (13,351,398)	$ (18,521,219)
Denominator:
Weighted average common shares outstanding - basic	57,443,706	39,503,340	54,571,012	37,136,759
Effect of dilutive securities
Diluted weighted average shares outstanding	57,443,706	39,503,340	54,571,012	37,136,759
Net loss per common share:
Basic	$ (0.11)	$ (0.26)	$ (0.24)	$ (0.50)
Diluted	$ (0.11)	$ (0.26)	$ (0.24)	$ (0.50)