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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net loss $ (36,281) $ (14,892)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 4,429 3,876
Lease expense (86) (51)
Depreciation expense 167 154
Amortization of premium on marketable securities (2,361) (645)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (1,681) 33
Accounts payable 1,626 658
Accrued expenses 9,765 (4,043)
Other assets 23 (6)
Net cash used in operating activities: (24,399) (14,916)
Cash flows from investing activities:    
Purchase of property and equipment (274)  
Purchases of marketable securities (166,582) (9,847)
Maturities and sales of marketable securities 35,000 92,259
Net cash provided by (used in) investing activities (131,856) 82,412
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 11  
Net cash provided by financing activities 161,817  
Net increase in cash, cash equivalents and restricted cash 5,562 67,496
Cash, cash equivalents and restricted cash at beginning of period 28,088 28,164
Cash, cash equivalents and restricted cash at end of period 33,650 $ 95,660
Supplemental disclosure of non-cash investing and financing activities:    
Purchases of property and equipment included in accounts payable and accrued expenses 53  
Offering costs included in accounts payable and accrued expense 50  
Leased assets obtained in exchange for new operating lease liabilities $ 465