Prepaid Expenses and Other Current Assets (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Prepaid Expenses and Other Current Assets
Prepaid development expenses	$ 957,814	$ 2,671,815
Prepaid insurance	841,858	393,451
Deferred financing costs	193,505	255,754
Other current assets	385,635	426,067
Total prepaid expenses and other current assets	$ 2,378,812	$ 3,747,087