Condensed Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities
Net loss	$ (50,231)	$ (31,938)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation, amortization and accretion	(1,477)	(97)
Reduction in the carrying amount of operating lease right of use assets	1,143	1,115
Stock-based compensation	5,349	3,687
Change in fair value of non-marketable equity securities	30	543
Changes in operating assets and liabilities:
Prepaid expense and other current assets	1,451	(7,546)
Other assets	(304)	(32)
Accounts payable	1,289	5,699
Accrued and other current liabilities	31	1,817
Operating lease liabilities	(1,345)	(1,262)
Net cash used in operating activities	(44,064)	(28,014)
Cash flows from investing activities
Purchase of property and equipment	0	(24)
Purchase of marketable securities	(143,058)	(97,524)
Proceeds from maturities of marketable securities	59,300	15,999
Proceeds from sale of marketable securities	9,543	0
Net cash used in investing activities	(74,215)	(81,549)
Cash flows from financing activities
Proceeds from exercise of stock options and employee stock purchase plan	672	281
Proceeds from issuance of Class A common stock in follow-on offering	115,000	86,131
Payment of costs and underwriting discounts and commissions related to follow-on offering	(7,256)	(6,096)
Net cash provided by financing activities	108,416	80,316
Net decrease in cash and cash equivalents and restricted cash	(9,863)	(29,247)
Cash, cash equivalents and restricted cash, beginning of period	43,752	79,967
Cash, cash equivalents and restricted cash, end of period	33,889	50,720
Supplemental disclosure of cash flow information
Cash paid for interest	1,636	217
Cash paid for operating leases	1,492	1,311
Receivable on exercise of stock options	5	0
Cash and cash equivalents [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash, end of period	33,889	50,427
Restricted cash [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash, end of period	$ 0	$ 293