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Net Loss Per Common Share (Reconciliation of Net Loss Per Share) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Numerator:    
Net loss $ (5,763,032) $ (7,332,598)
Preferred stock dividends (1,034,307) (1,105,877)
NET LOSS AVAILABLE TO COMMON SHAREHOLDERS $ (6,797,339) $ (8,438,475)
Denominator:    
Weighted average common shares outstanding - basic 51,666,399 34,770,178
Effect of dilutive securities      
Diluted weighted average shares outstanding 51,666,399 34,770,178
Net loss per common share:    
Basic $ (0.13) $ (0.24)
Diluted $ (0.13) $ (0.24)