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Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities    
Net loss $ (60,022) $ (44,307)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 953 619
Stock-based compensation 10,095 7,848
Amortization (accretion) of (discount) on marketable securities, net (6,703) (4,970)
Amortization of right-of-use asset 106 83
Changes in assets and liabilities:    
Prepaid expenses and other assets 914 (2,017)
Accounts payable 2,673 (472)
Accrued compensation (1,451) (907)
Accrued other expenses and other liabilities (927) 947
Lease liability (335) 116
Net cash used in operating activities (54,697) (43,060)
Cash flows from investing activities    
Purchases of marketable securities (368,558) (131,413)
Sales of marketable securities 1,759 5,146
Maturities of marketable securities 136,377 183,878
Purchases of property and equipment (518) (5,127)
Net cash (used in) provided by investing activities (230,940) 52,484
Cash flows from financing activities    
Proceeds from issuance of common stock, net of underwriting discounts and commissions and offering costs 239,147  
Exercise of stock options 3,503 52
Payment of deferred offering costs (48)  
Proceeds from Employee Stock Purchase Plan 423 338
Net cash provided by financing activities 243,025 390
Net change in cash and cash equivalents (42,612) 9,814
Cash and cash equivalents at beginning of period 86,097 21,993
Cash and cash equivalents at end of period 43,485 31,807
Supplemental disclosures of non-cash investing and financing activities:    
Right-of-use asset obtained in exchange for new operating lease liability, net of tenant improvement receivable   1,118
Property and equipment purchases included in accounts payable and accrued other expenses 116 324
Deferred offering costs included in accounts payable and accrued other expenses $ 214 $ 168