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Summary of Significant Accounting Policies (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Basic and dilutive net loss per share computations    
Net loss $ (6,416,447) $ (10,229,439)
Weighted average shares outstanding used to compute basic and diluted net income or loss per share 38,263,434 22,958,498
Basic and diluted net loss per share $ (0.17) $ (0.45)