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Statements of Operations and Comprehensive Income (Loss) (USD $)
 3 Months Ended 130 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Income Statement [Abstract]      
Revenue   $ 3,807,592 $ 23,594,763
Costs and expenses:      
Research and development expense 3,881,720 2,742,932 74,682,389
Selling, general and administrative expense 1,224,903 605,938 17,211,747
Total costs and expenses 5,106,623 3,348,870 91,894,136
(Loss) income from operations (5,106,623) 458,722 (68,299,373)
Other income (expense):      
Interest income (expense), net 4,773 965 (167,564)
Other expense, net     89,678
Total other income (expense) 4,773 965 (77,886)
Net (loss) income and comprehensive (loss) income $ (5,101,850) $ 459,687 $ (68,377,259)
Net (loss) income share-basic $ (0.30) $ 0.49  
Net (loss) income per share-diluted $ (0.30) $ 0.04  
Weighted average shares outstanding-basic 17,232,566 930,529  
Weighted average shares outstanding-diluted 17,232,566 11,128,733