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Condensed Statements of Comprehensive Loss (USD $)
3 Months Ended 52 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Condensed Statements of Comprehensive Loss      
Net loss $ (6,253,233) $ (9,174,109) $ (65,873,235)
Other comprehensive income (loss):      
Unrealized gain (loss) on short-term investments   5,737  
Comprehensive loss $ (6,253,233) $ (9,168,372) $ (65,873,235)