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Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities    
Net loss $ (24,468) $ (4,425)
Reconciliation of net loss to net cash used in operating activities:    
Depreciation 47 1
Stock-based compensation 3,133 29
Amortization of premiums on investment securities, net (103) (69)
Non-cash interest expense   12
Non-cash interest expense—related party   26
Non-cash lease expense 5  
Change in operating assets and liabilities:    
Prepaid expense and other assets (1,158) (71)
Prepaid expense and other assets—related party (60)  
Deferred revenue   (193)
Accounts payable and other liabilities 2,444 708
Accounts payable and other liabilities related-party 10 (1,843)
Net cash used in operating activities (20,150) (5,825)
Cash flows from investing activities    
Purchases of investment securities (36,356) (55,589)
Proceeds from maturities of investment securities 33,955 20,092
Purchases of property and equipment (1,184) (62)
Net cash used in investing activities (3,585) (35,559)
Cash flows from financing activities    
Proceeds from initial public offering, net of issuance costs 254,271
Proceeds from issuance of convertible preferred stock, net of issuance costs 124,712 44,731
Proceeds from the exercise of stock options and vesting of restricted stock 35
Proceeds from the issuance of notes payable, net of issuance costs—related party 200
Repayment of notes payable—related party (400)
Net cash provided by financing activities 379,018 44,531
Net increase in cash and cash equivalents 355,283 3,147
Cash and cash equivalents at beginning of period 2,379 77
Cash and cash equivalents at end of period 357,662 3,224
Supplemental disclosures    
Initial recognition of operating lease right-of-use asset and operating lease liability 3,786  
Purchases of property and equipment included in accounts payable and accrued expenses $ 112  
Conversion of convertible notes to convertible preferred shares, including bifurcated conversion liability   271
Conversion of convertible notes to convertible preferred shares, including bifurcated conversion liability - related party   354
Interest paid   $ 18