Income Taxes - Deferred tax assets (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets:
Net operating loss carryforwards	$ 9,479,512	$ 5,453,854
Stock-based compensation expense	943,370	616,207
Property and equipment	(14,030)	2,486
Intangibles	328,773	310,230
Research and development tax credits	1,584,753	1,008,443
Deferred tax assets	12,322,378	7,391,220
Valuation allowance	$ (12,322,378)	(7,391,220)
Deferred tax assets, net		$ 0