Accrued Expenses and Other Current Liabilities (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Bonus	$ 1,191,940	$ 2,357,194
Professional fees	520,923	481,641
Vacation	337,020	262,664
Other (primarily R&D vendors and CMOs)	1,048,032	1,483,253
Accrued expenses and other current liabilities	$ 3,097,915	$ 4,584,752