Accrued Expenses (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Accrued Expenses [Abstract]
Accrued research and development costs	$ 250,760	$ 1,874,126
Accrued professional fees	352,617	258,568
Accrued compensation	846,759	1,510,430
Accrued other	41,146	56,835
Deferred rent	28,627	34,389
Total	$ 1,519,909	$ 3,734,348