Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating activities:
Net loss	$ (42,375,000)	$ (26,095,000)	$ (77,002,000)	$ (48,996,000)
Reconciliation of net loss to net cash used in operating activities:
Stock-based compensation			12,886,000	7,639,000
Depreciation and amortization			455,000	454,000
Noncash lease expense			195,000	163,000
Accretion of purchase discounts and amortization of premiums on investment securities, net			517,000	170,000
Loss on equity method investment	0	0	1,010,000	0
Change in valuation of derivative asset	(31,000)		(31,000)
Other, net			0	(1,000)
Increase (decrease) in cash resulting from changes in:
Prepaid expenses and other assets			3,234,000	(941,000)
Accounts payable and accrued expenses			8,241,000	1,901,000
Deferred revenue			9,431,000	0
Operating lease liability			(455,000)	(405,000)
Net cash used in operating activities			(41,519,000)	(40,016,000)
Investing activities:
Purchases of investment securities			(247,572,000)	(2,535,000)
Maturities of investment securities			30,617,000	55,153,000
Purchases of property and equipment			(700,000)	(278,000)
Net cash (used in) provided by investing activities			(217,655,000)	52,340,000
Financing activities:
Proceeds from issuance of common stock, net of $7.8 million (2022) and $2.4 million (2021) of transaction costs			117,255,000	72,558,000
Proceeds from exercise of stock options			3,517,000	802,000
Net Cash Provided by (Used in) Financing Activities, Total			120,772,000	73,360,000
Net change in cash, cash equivalents and restricted cash			(138,402,000)	85,684,000
Cash, cash equivalents and restricted cash at beginning of period			201,195,000	93,587,000
Cash, cash equivalents and restricted cash at end of period	62,793,000	179,271,000	62,793,000	179,271,000
Components of cash, cash equivalents and restricted cash:
Cash and cash equivalents	62,293,000	178,771,000	62,293,000	178,771,000
Restricted cash	500,000	500,000	500,000	500,000
Cash, cash equivalents and restricted cash at end of period	$ 62,793,000	$ 179,271,000	62,793,000	179,271,000
Noncash investing and financing activities:
Change in unvested stock liability			2,000	11,000
Stock issued under Stock Purchase Plan			813,000	522,000
Amounts accrued for follow-on offering costs			13,000	0
Amounts accrued for purchases of property and equipment			$ 82,000	$ 0