Prepaid Expenses and Other Current Assets (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Prepaid Expenses and Other Current Assets
Prepaid development expenses	$ 1,666,975	$ 1,211,668
Prepaid insurance	76,523	282,440
Other	25,496	51,809
Total prepaid expenses and other current assets	1,768,994	1,545,917
Research and grant revenue remitted to third party research organizations, included in prepaid development expenses	$ 800,000	$ 800,000