Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Cash flows from operating activities:
Net loss	$ (70,760)	$ (68,373)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation and amortization	734	121
Noncash lease expense	1,460
Interest expense related to convertible notes		40
Stock-based compensation expense	7,871	177
Change in fair value of the Series A redeemable convertible preferred stock tranche liability	10,341	54,833
Issuance of common stock to Stanford		2,772
Changes in assets and liabilities:
Prepaid expenses and other current assets and other assets	(3,914)	(1,286)
Accounts payable	1,825	594
Accrued compensation	2,223	466
Accrued research costs	(1,131)	1,764
Accrued expenses and other current liabilities and other liabilities	257	171
Operating lease liabilities	(1,758)
Net cash used in operating activities	(52,852)	(8,721)
Cash flows from investing activities:
Purchases of property and equipment	(5,740)	(1,545)
Net cash used in investing activities	(5,740)	(1,545)
Cash flows from financing activities:
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs	165,521	24,816
Proceeds from issuance of common stock under initial public offering, net of issuance costs	251,323
Proceeds from issuance of convertible note to related party		5,000
Proceeds from issuance of common stock upon exercise of stock options	28
Proceeds from issuance of common stock upon early exercises of stock options	289	261
Proceeds from issuance under employee stock purchase plan	306
Net cash provided by financing activities	417,467	30,077
Net increase in cash, cash equivalents and restricted cash	358,875	19,811
Cash, cash equivalents and restricted cash, at beginning of period	19,817	6
Cash, cash equivalents and restricted cash, at end of period	378,692	19,817
Reconciliation of cash, cash equivalents and restricted cash to statement of financial position:
Cash and cash equivalents	376,976	19,782
Restricted cash	1,716	35
Cash, cash equivalents and restricted cash in statement of financial position	378,692	19,817
Supplemental disclosures of non-cash investing and financing information:
Issuance of redeemable convertible preferred stock upon conversion of outstanding related party convertible note and accrued interest		5,020
Related party convertible note and accrued interest cancellation		(2,225)
Purchases of property and equipment included in accounts payable	(75)	(35)
Settlement of redeemable convertible preferred stock tranche liability	(39,403)	(29,100)
Conversion of redeemable convertible preferred stock to common stock at closing of initial public offering	260,532
Additions to right-of-use assets from new operating lease liabilities	13,034
Vesting of early exercised stock options	144	$ 9
Repurchase of unvested early exercised shares included in accounts payable	(42)
Proceeds from issuance of common stock upon exercise of stock options included in accounts receivable	$ (14)