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Earnings Per Share (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Numerator        
Net loss $ (6,479,554) $ (6,752,668) $ (13,062,656) $ (13,995,868)
Denominator        
Weighted average number of common shares outstanding (in shares) 37,853,358 16,320,235 30,645,479 14,781,215