Condensed Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net loss		$ (37,238,000)	$ (1,453,000)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation	$ 1,000	206,000	1,000
Interest expense related to convertible notes	20,000		40,000
Stock-based compensation expense		3,051,000	1,000
Change in fair value of the Series A redeemable convertible preferred stock tranche liability		10,341,000
Changes in assets and liabilities:
Prepaid expenses and other current assets and other assets		(1,363,000)	(361,000)
Accounts payable		3,451,000	280,000
Accrued compensation		257,000	53,000
Accrued expenses and other current liabilities and other liabilities		(549,000)	482,000
Net cash used in operating activities		(21,844,000)	(957,000)
Cash flows from investing activities:
Purchases of property and equipment		(1,123,000)	(379,000)
Net cash used in investing activities		(1,123,000)	(379,000)
Cash flows from financing activities:
Net proceeds from issuance of redeemable convertible preferred stock, net of issuance costs		165,521,000	9,998,000
Proceeds from issuance of initial public offering, net of issuance costs		219,454,000
Proceeds from issuance of convertible note to related party			5,000,000
Proceeds from issuance of common stock upon exercise of stock options		21,000
Proceeds from issuance of common stock shares upon early exercises of stock options		268,000
Net cash provided by financing activities		385,264,000	14,998,000
Net increase in cash, cash equivalents and restricted cash		362,297,000	13,662,000
Cash, cash equivalents and restricted cash, at beginning of period		19,817,000	6,000
Cash, cash equivalents and restricted cash, at end of period	13,668,000	382,114,000	13,668,000
Reconciliation of cash, cash equivalents and restricted cash to statement of financial position:
Cash and cash equivalents	13,633,000	381,965,000	13,633,000
Restricted cash	35,000	149,000	35,000
Cash, cash equivalents and restricted cash, at end of period	$ 13,668,000	382,114,000	13,668,000
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			5,020,000
Related party convertible note and accrued interest cancellation			(2,225,000)
Purchases of property and equipment included in accounts payable			15,000
Conversion of redeemable convertible preferred stock to common stock at closing of initial public offering		260,532,000
Vesting of early exercised stock options		49,000
Offering costs included in accrued expenses		$ 1,277,000
Issuance costs for Series B redeemable convertible preferred stock included in accounts payable			$ 177,000