Prepaid Expenses and Other Current Assets (Schedule of Prepaid Expenses and Other Current Assets) (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid manufacturing expense	$ 1,551,597	$ 57,131
Prepaid insurance	218,750	217,500
Other prepaid expenses	87,937	63,418
Other current assets	108,973
Prepaid expenses and other current assets	$ 1,967,257	$ 338,049