Income Taxes - Reconciliation of Income Taxes Computed by Applying Statutory Federal Income Tax Rate (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income tax expense (benefit) at statutory rates	$ (9,315,000)	$ (5,194,000)
State income tax, net of federal benefit	(3,004,000)	(1,057,000)
Permanent items	1,000	14,000
Book income for pre-conversion period		527,000
Interest on convertible notes		445,000
Realized gain on conversion of convertible notes		958,000
Reserve for uncertain tax positions	398,000	140,000
Research and development tax credits	(1,639,000)	(584,000)
Deferred taxes recognized upon conversion		(3,076,000)
Valuation allowance	13,488,000	7,827,000
Other	71,000
Income tax expense (benefit)	$ 0	$ 0