Accrued Expenses (Schedule of Accrued Expenses) (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Accrued Liabilities, Current [Abstract]
Accrued clinical trial expenses	$ 1,504,240	$ 580,218
Compensation and related benefits	542,434	642,532
Patent fees	40,000	40,000
Deferred rent	27,457	42,423
Other expenses	162,300
Accrued expenses	$ 2,276,431	$ 1,305,173