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Statements of Operations and Comprehensive Loss - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statements of Operations and Comprehensive (Loss) Income        
Revenue $ 18,500   $ 18,500 $ 20,035,375
Costs and expenses:        
Research and development expense 5,921,461 $ 5,038,380 17,221,360 18,088,994
General and administrative expense 1,983,795 2,132,993 6,352,355 5,843,680
Total costs and expenses 7,905,256 7,171,373 23,573,715 23,932,674
Loss from operations (7,886,756) (7,171,373) (23,555,215) (3,897,299)
Other income 32,063 3,302 73,974 9,504
Net loss and comprehensive loss $ (7,854,693) $ (7,168,071) $ (23,481,241) $ (3,887,795)
Basic and diluted net loss per common share (in dollars per share) $ (0.34) $ (0.38) $ (1.14) $ (0.20)
Basic and diluted weighted average number of common shares (in shares) 23,049,347 19,025,623 20,638,129 18,999,705