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Statements of Operations and Comprehensive (Loss) Income - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Costs and expenses:    
Research and development expense $ 5,518,722 $ 5,207,730
General and administrative expense 2,056,353 1,904,963
Total costs and expenses 7,575,075 7,112,693
Loss from operations (7,575,075) (7,112,693)
Other income 20,097 3,564
Net loss and comprehensive loss $ (7,554,978) $ (7,109,129)
Basic and diluted net loss per common share (in dollars per share) $ (0.40) $ (0.37)
Basic and diluted weighted average number of common shares (in shares) 19,071,838 18,961,531