Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities:
Net loss	$ (8,491,000)	$ (5,355,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	108,000	78,000
Stock-based compensation expense	328,000	120,000
Noncash lease expense	311,000	136,000
Noncash interest and other expense, net	64,000	3,000
Changes in operating assets and liabilities:
Prepaid expenses and other assets	178,000	(350,000)
Accounts payable	(323,000)	(314,000)
Accrued expenses and other liabilities	1,063,000	(480,000)
Interest payable	2,000	92,000
Operating lease liabilities	(347,000)	(240,000)
Cash used in operating activities	(7,107,000)	(6,310,000)
Investing activities:
Purchase of property and equipment	(3,000)	(14,000)
Cash used in investing activities	(3,000)	(14,000)
Financing activities:
Proceeds from the issuance of common stock, net of equity issuance costs	1,403,000	0
Borrowings on loan payable	0	15,000,000
Payment of loan issuance costs	0	(59,000)
Proceeds from option exercises	0	3,000
Cash provided by financing activities	1,403,000	14,944,000
Net (decrease) increase in cash and cash equivalents	(5,707,000)	8,620,000
Cash, cash equivalents and restricted cash at beginning of period	51,829,000	18,820,000
Cash, cash equivalents and restricted cash at end of period	46,122,000	27,440,000
Supplemental disclosure of cash flow information:
Cash paid for interest	268,000	108,000
Non-cash investing activities: Property and equipment in accounts payable	16,000	0
Non-cash financing activities:
Vesting of early exercise stock options	$ 0	$ 57,000