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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities:    
Net loss $ (51,780) $ (23,956)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 6,386 5,697
Lease expense (132) (58)
Depreciation expense 241 230
Amortization of premium on marketable securities (4,074) (1,210)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (6,164) (579)
Accounts payable 403 (930)
Accrued expenses 6,137 (3,314)
Other assets 38 4
Net cash used in operating activities: (48,945) (24,116)
Cash flows from investing activities:    
Purchase of property and equipment (336)  
Purchases of marketable securities (189,248) (66,268)
Maturities and sales of marketable securities 85,000 102,250
Net cash provided by (used in) investing activities (104,584) 35,982
Cash flows from financing activities:    
Proceeds from issuance of equity securities, net of issuance costs 161,806  
Proceeds from exercise of stock options and warrants 41 30
Net cash provided by financing activities 161,847 30
Net increase in cash, cash equivalents and restricted cash 8,318 11,896
Cash, cash equivalents and restricted cash at beginning of period 28,088 28,164
Cash, cash equivalents and restricted cash at end of period 36,406 40,060
Supplemental disclosure of non-cash investing and financing activities:    
Offering costs included in accounts payable and accrued expense 50  
Leased assets obtained in exchange for new operating lease liabilities $ 465 $ 452