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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating activities    
Net loss $ (19,928) $ (11,188)
Reconciliation of net loss to net cash used in operating activities:    
Stock-based compensation expense 2,754 1,220
Right-of-use asset - operating lease 153 142
Other non-cash items (665) (26)
Changes in assets and liabilities:    
Prepaid expenses and other assets (930) (864)
Lease liability - operating lease (161) (145)
Accounts payable (651) 140
Accrued expenses 334 (2,532)
Net cash used in operating activities (19,094) (13,253)
Investing activities    
Purchases of short-term investments (1,049,231) (95,923)
Sales and maturities of short-term investments 923,000 290,920
Purchases of property and equipment   (5)
Net cash (used in) provided by investing activities (126,231) 194,992
Financing activities    
Proceeds from public offering, net of underwriting discounts and issuance costs 117,172  
Proceeds from at-the-market offering, net of issuance costs 20,002  
Proceeds from exercise of stock options and warrants 4,633 37
Net cash provided by financing activities 141,807 37
Net (decrease) increase in cash, cash equivalents and restricted cash (3,518) 181,776
Cash, cash equivalents and restricted cash, beginning of period 175,693 20,688
Cash, cash equivalents and restricted cash, end of period 172,175 202,464
Supplemental disclosure of non-cash transactions:    
Conversion of Series X Preferred Stock into common stock   $ 1,074
Public offering issuance costs in accounts payable and accrued expenses $ 280