Income Taxes - Difference in Actual Income Tax Expense Computed by Applying the Statutory Federal Income Tax Rate to Loss Before Income Taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Computed tax (benefit) at 21%	$ (4,051,800)	$ (3,454,582)
State taxes, net of federal benefit	(881,670)	(384,035)
Stock-based compensation	183,167	82,024
Foreign tax rate differential	4,298	(3,158)
Return to provision	80,668	(31,111)
Other	51,737	51,598
Uncertain tax position adjustment for prior periods	650,687	1,029,115
Increase in valuation allowance	4,610,490	3,731,884
Total income tax expense	3,379	3,526
State
Income Tax Disclosure [Line Items]
Research and development tax credit	(342,320)	(511,845)
Federal
Income Tax Disclosure [Line Items]
Research and development tax credit	$ (301,878)	$ (506,364)