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Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
OPERATING ACTIVITIES:    
Net loss $ (83,938) $ (10,137)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 2,379 2,055
Amortization of insurance premium 384 766
Amortization of operating lease right-of-use assets 119 114
Amortization of leasehold improvements 1  
Change in operating lease liability (124) (117)
Change in fair value of warrant liabilities 63,405 (469)
Changes in operating assets and liabilities:    
Prepaid expenses (319) (184)
Accounts payable 527 1,021
Accrued expenses and other current liabilities (586) (109)
Other liabilities (759) 70
Net cash used in operating activities (18,911) (6,990)
INVESTING ACTIVITIES:    
Proceeds from sale of available-for-sale securities   4,944
Proceeds from maturities of available-for-sale securities   8,928
Net cash provided by investing activities   13,872
FINANCING ACTIVITIES:    
Proceeds from issuance of common stock and pre-funded warrants, net of issuance costs 106,750  
Repayments of short-term borrowings (311) (622)
Exercise of common warrants 9,025  
Exercise of stock options 33  
Net cash provided by (used in) financing activities 115,497 (622)
NET INCREASE IN CASH AND CASH EQUIVALENTS 96,586 6,260
Cash and cash equivalents at beginning of period 49,898 16,657
Cash and cash equivalents at end of period 146,484 22,917
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Offering costs in accrued expenses 252  
Offering costs in accounts payable 1,750  
Conversion of warrant liabilities to equity for warrant exercises $ 52,193  
Unrealized loss on marketable securities   $ (51)