Income Taxes - Reconciliation of Income Taxes Computed by Applying Statutory Federal Income Tax Rate (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income tax expense (benefit) at statutory rates	$ (24,784,000)	$ (9,315,000)	$ (5,194,000)
State income tax, net of federal benefit	(7,868,000)	(3,004,000)	(1,057,000)
Permanent items	210,000	1,000	14,000
Book income for pre-conversion period	0	0	527,000
Interest on convertible notes	0	0	445,000
Realized gain on conversion of convertible notes	0	0	958,000
Reserve for uncertain tax positions	1,170,000	398,000	140,000
Research and development tax credits	(4,792,000)	(1,639,000)	(584,000)
Deferred taxes recognized upon conversion	0	0	(3,076,000)
Valuation allowance	35,326,000	13,488,000	7,827,000
Other	738,000	71,000	0
Income tax expense (benefit)	$ 0	$ 0	$ 0