Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities
Net loss	$ (20,980,000)	$ (8,866,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	2,731,000	974,000
Depreciation expense	154,000	112,000
Non-cash lease expense	45,000	28,000
Amortization of premiums and accretion of discounts on available-for-sale securities, net	140,000	131,000
Changes in operating assets and liabilities:
Unbilled grant receivable	102,000	(1,606,000)
Prepaid expenses and other current assets	1,141,000	1,914,000
Accounts payable and accrued liabilities	164,000	(374,000)
Operating lease liability	(69,000)	382,000
Net cash used in operating activities	(16,572,000)	(7,305,000)
Investing activities
Purchases of available-for-sale securities	(17,828,000)	(93,143,000)
Maturities of available-for-sale securities	42,419,000	70,739,000
Purchases of property and equipment	(745,000)	(304,000)
Net cash used in investing activities	23,846,000	(22,708,000)
Financing activities
Proceeds from exercise of common stock options	210,000	39,000
Proceeds from initial public offering, net of issuance costs		97,172,000
Net cash provided by financing activities	210,000	97,211,000
Net increase in cash and cash equivalents	7,484,000	67,198,000
Cash and cash equivalents, beginning of period	110,537,000	60,625,000
Cash and cash equivalents, end of period	118,021,000	127,823,000
Supplemental disclosures of cash flow information:
Purchases of property and equipment included in accounts payable and accrued liabilities	$ 6,000	57,000
Right-of-use asset obtained in exchange for new operating lease liability		$ 518,000