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Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities    
Net loss $ (13,265) $ (5,514)
Reconciliation of net loss to net cash used in operating activities:    
Depreciation 82 4
Stock-based compensation 2,360 647
Amortization of premiums on investment securities, net 19 (150)
Non-cash lease expense 14  
Change in operating assets and liabilities:    
Prepaid expense and other assets (1,237)  
Prepaid expense and other assets—related party   (60)
Accounts payable and other liabilities 215 1,376
Accounts payable and other liabilities related-party (15)  
Net cash used in operating activities (11,827) (3,697)
Cash flows from investing activities    
Purchases of investment securities   (5,111)
Proceeds from maturities of investment securities 490 28,172
Purchases of property and equipment (76) (33)
Net cash provided by investing activities 414 23,028
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
Proceeds from the exercise of stock options 156  
Net cash provided by financing activities 156 378,983
Net (decrease) increase in cash and cash equivalents (11,257) 398,314
Cash and cash equivalents at beginning of period 298,569 2,379
Cash and cash equivalents at end of period 287,312 $ 400,693
Supplemental disclosures    
Purchases of property and equipment included in accounts payable and accrued expenses $ 19