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CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Operating activities:    
Net loss $ (47,038) $ (39,545)
Adjustments to reconcile net loss to cash used in operating activities:    
Change in fair value of Series B preferred stock tranche rights liability 0 13,356
Stock-based compensation 4,216 1,134
Depreciation 41 5
Non-cash lease expense 199 26
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (280) (855)
Operating lease liabilities (211) (7)
Net cash used in operating activities (44,719) (37,592)
Investing activities:    
Purchase of property and equipment (31) (150)
Proceeds from sale of property and equipment 62 0
Net cash provided by (used in) investing activities 31 (150)
Financing activities:    
Proceeds from issuance on common stock, net of issuance costs 333,479 0
Proceeds from issuance of preferred stock and preferred stock tranche rights, net 0 77,645
Proceeds from exercise of options 1,527 149
Net cash provided by financing activities 335,006 77,794
Net increase in cash and cash equivalents 290,318 40,052
Cash and cash equivalents at beginning of period 230,440 4,158
Cash and cash equivalents at end of period 520,758 44,210
Non-cash investing and financing activities:    
Settlement of Series B preferred stock tranche rights, upon issuance of milestone shares 0 8,001
Right-of-use asset obtained in exchange for lease liability 0 703
Vesting of early exercise stock options 51 51
Offering costs included in accounts payable and accrued expenses 1,052 0
Fair value recognized upon the issuance of preferred stock tranche rights 0 642
Nonrelated Party    
Changes in operating assets and liabilities:    
Accounts payable and accrued expenses 728 (410)
Related Party    
Changes in operating assets and liabilities:    
Accounts payable and accrued expenses $ (2,374) $ (11,296)