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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net loss $ (14,792) $ (21,726)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 5,041 4,837
Depreciation and amortization 58 56
Non-cash lease expense (38) (17)
Change in fair value of warrant liability 1,459 (142)
Net amortization on marketable securities (2,820) (2,147)
Net loss on marketable securities (1) 96
Net loss on disposal of property and equipment 0 12
Change in operating assets and liabilities (net of assets and liabilities acquired in the Merger)    
Prepaid expenses and other current assets (5,277) 137
Interest receivable on marketable securities (581) 212
Other non-current assets (488) 0
Accounts payable 227 806
Accrued expenses 1,510 (1,454)
Net cash used in operating activities (15,702) (19,330)
Cash flow from investing activities:    
Purchases of marketable securities (128,409) (236,967)
Proceeds from sale of marketable securities 135,978 184,983
Purchases of property and equipment (27) (12)
Net cash (used in) provided by investing activities 7,542 (51,996)
Cash flow from financing activities:    
Proceeds from exercises of options 21 298
Net cash provided by financing activities 21 298
Net decrease in cash and cash equivalents (8,139) (71,028)
Cash and cash equivalents, beginning of the period 42,649 101,099
Cash and cash equivalents, end of the period $ 34,510 $ 30,071