Income Taxes - Deferred Tax Assets (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 1,592,993	$ 31,239,750
Research and development credit carryforwards	0	2,599,358
Accrued expenses	96,030	965,191
Stock-based compensation	222,420	227,843
Other	(9,455)	9,158
Total gross deferred tax assets	2,208,843	35,041,300
Valuation allowance	(2,208,843)	(35,041,300)
Net deferred tax assets	$ 0	$ 0