Accrued Expenses (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Accrued Expenses [Abstract]
Accrued research and development costs	$ 654,795	$ 1,874,126
Accrued professional fees	366,394	258,568
Accrued compensation	1,866,255	1,510,430
Accrued other	319,434	56,835
Deferred rent	6,837	34,389
Total	$ 3,213,715	$ 3,734,348