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Statements of Operations and Comprehensive Income - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Statement [Abstract]        
Revenue     $ 20,035,375 $ 15,027,004
Costs and expenses:        
Research and development expense $ 5,038,380 $ 5,050,666 18,088,994 14,290,083
General and administrative expense 2,132,993 1,648,496 5,843,680 4,478,491
Total costs and expenses 7,171,373 6,699,162 23,932,674 18,768,574
Loss from operations (7,171,373) (6,699,162) (3,897,299) (3,741,570)
Other income 3,302 4,827 9,504 13,863
Loss and comprehensive loss before income taxes (7,168,071) (6,694,335) (3,887,795) (3,727,707)
Income tax (benefit)   (76,758)   0
Net loss and comprehensive loss $ (7,168,071) $ (6,617,577) $ (3,887,795) $ (3,727,707)
Net loss per share—basic $ (0.38) $ (0.35) $ (0.20) $ (0.20)
Net loss per share—diluted $ (0.38) $ (0.35) $ (0.20) $ (0.20)
Weighted average shares outstanding—basic 19,025,623 18,893,834 18,999,705 18,311,358
Weighted average shares outstanding—diluted 19,025,623 18,893,834 18,999,705 18,311,358