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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows used in operating activities:    
Net loss $ (155,671) $ (59,587)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 15,623 2,045
Depreciation expense 305 30
Amortization (accretion) of investment premiums (discounts) (196) 23
Change in fair value of convertible notes   5,228
Changes in operating assets and liabilities:    
Accounts receivable, net (137)  
Inventories (563)  
Interest receivable (61)  
Prepaid expenses and other current assets (2,879) (1,764)
Operating lease right-of-use assets 1,208  
Other assets (456) 125
Accounts payable 2,654 (716)
Accrued expenses and deferred rent 10,435 8,061
Operating lease liabilities (436)  
Net cash used in operating activities (130,174) (46,555)
Cash flows used in investing activities:    
Purchases of property and equipment (1,906) (167)
Purchases of investments (154,313) (49,053)
Proceeds from maturities of short-term investments 145,411  
Net cash used in investing activities (10,808) (49,220)
Cash flows provided by financing activities:    
Proceeds from initial public offering 200,897  
Initial public offering costs paid (1,518)  
Proceeds from issuance of convertible notes—related parties   14,272
Proceeds from issuance of convertible notes   11,887
Proceeds from issuance of Series C-1 redeemable convertible preferred stock, net of issuance costs   134,791
Issuance costs related to conversion of convertible notes   (50)
Payment of deferred offering costs   (1,527)
Proceeds from exercise of stock options 248 198
Net cash provided by financing activities 199,627 159,571
Effect of exchange rate changes on cash, cash equivalents and restricted cash (572) 4
Net increase in cash, cash equivalents and restricted cash 58,073 63,800
Cash, cash equivalents and restricted cash, beginning of period 50,380 13,066
Cash, cash equivalents and restricted cash, end of period 108,453 76,866
Supplemental disclosure of cash flow information:    
Unrealized loss on short-term investments 165 (5)
Purchases of property and equipment included in accounts payable 43 41
Right-of-use assets and liabilities upon ASC842 adoption 2,201  
Right-of-use assets obtained in exchange for lease liabilities 4,958  
Movement of deferred offering costs to equity 4,518  
Initial public offering costs included in accounts payable and accrued expenses 526  
Public offering costs included in accounts payable and accrued expenses 570  
Deferred offering costs included in accounts payable and accrued expenses   189
Conversion of convertible notes and accrued interest into redeemable convertible preferred stock   $ 32,548
Conversion of preferred stock to common stock upon initial public offering 239,351  
Income taxes paid $ 27