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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net loss $ (59,131) $ (54,168)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation 830 348
Stock-based compensation expense 5,126 3,404
Amortization and interest accretion related to operating leases (212)  
Change in fair value of preferred stock warrant liability   (58)
Other non-cash adjustments   136
Changes in operating assets and liabilities:    
Other receivables 25 32
Prepaids and other current and non-current assets 732 (879)
Accounts payable 2,561 1,829
Accrued expenses and other non-current liabilities 1,985 3,478
Operating lease liabilities, current and non-current (1,489)  
Net cash used in operating activities (49,573) (45,878)
Cash flows from investing activities:    
Purchases of property and equipment (2,415) (2,653)
Net cash used in investing activities (2,415) (2,653)
Cash flows from financing activities:    
Issuance of common stock upon initial public offering, net of underwriters' fees   114,267
Payment of offering costs (430) (2,697)
Proceeds from the exercise of Series A-2 warrants   406
Proceeds from employee equity plans 215  
Net cash provided by financing activities (215) 111,976
Effect of exchange rate changes on cash 64 (557)
Net (decrease) increase in cash, cash equivalents and restricted cash (52,139) 62,888
Cash, cash equivalents and restricted cash at beginning of period 183,225 134,368
Cash, cash equivalents and restricted cash at end of period 131,086 197,256
Components of cash, cash equivalents and restricted cash    
Cash and cash equivalents 129,538 195,783
Restricted Cash 1,548 $ 1,473
Supplemental noncash investing and financing activities    
Property and equipment included in accounts payable and accrued expenses 123  
Deferred offering costs in accounts payable $ 12