Accrued Expenses (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Accrued Expenses [Abstract]
Accrued research and development costs	$ 1,674,808	$ 654,795
Accrued professional fees	597,914	366,394
Accrued compensation	1,030,102	1,866,255
Accrued other	324,068	319,434
Deferred rent	11,697	6,837
Total	$ 3,638,589	$ 3,213,715