Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets
Net operating loss carry forwards	$ 27,661,926	$ 24,399,299
Research and development credit carry forwards	2,666,036	2,291,226
Stock-based compensation	6,046,848	4,575,617
Other	650,018	706,745
Gross deferred tax assets	37,024,828	31,972,887
Deferred tax liabilities:
Property and equipment	(28,926)	(59,524)
Gross deferred tax liabilities	(28,926)	(59,524)
Less valuation allowance	(36,995,902)	(31,913,363)
Net deferred tax asset	0	0
Decrease in deferred tax asset and corresponding valuation allowance			$ 8,700,000
Increase in valuation allowance	5,100,000	11,100,000
Unrecognized tax benefits
Unrecognized Tax Benefits	$ 0	$ 0
Reconciliation of income tax expense (benefit) at the statutory federal income tax rate and income taxes
Federal income tax benefit at statutory rate	21.00%	21.00%	34.00%
State income tax, net of federal benefit	4.20%	6.80%	6.50%
Foreign tax rate differential	0.10%	0.30%
Nondeductible research and development expenses	(4.30%)	(2.20%)	(5.10%)
Other permanent differences			(0.10%)
Research and development credit benefit	1.00%	1.40%	1.30%
Adjustment of prior years' income taxes	(6.60%)
Rate change from 2017 Tax Cuts and Jobs Act		0.30%	(27.30%)
Change in valuation allowance	(15.40%)	(27.60%)	(9.30%)
Effective income tax rate	0.00%	0.00%	0.00%