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Accrued Expenses (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Accrued Expenses [Abstract]    
Accrued research and development costs $ 1,277,652 $ 654,795
Accrued professional fees 183,864 366,394
Accrued compensation 1,417,420 1,866,255
Accrued other 382,046 319,434
Deferred rent 21,416 6,837
Total $ 3,282,398 $ 3,213,715