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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Operating activities:    
Net loss $ (10,998) $ (3,824)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 1,724 900
Depreciation 29 29
Change in the fair value of warrant liability (1,777) (7,890)
Change in the fair value of promissory notes (423) 0
Promissory note issuance costs 335 0
Transaction costs associated with warrants 0 776
Accretion of discount on short-term investment (218) (381)
Changes in operating assets and liabilities:    
Prepaid expenses and other current and non-current assets (11) (1,004)
Accounts payable (88) 726
Accrued expenses and other liabilities (121) (839)
Net cash used in operating activities (11,548) (11,507)
Investing activities:    
Purchase of investments (13,940) (17,853)
Maturity of investments 12,845 9,850
Purchases of property and equipment (14) 0
Net cash used in investing activities (1,109) (8,003)
Financing activities:    
Proceeds from issuance of common stock, net of issuance costs 8 18,983
Proceeds from exercise of stock options 0 4
Proceeds from issuance of promissory note payable, net 9,664 0
Proceeds from issuance of common stock from ATM Facility, net of issuance costs 968 49
Net cash provided by financing activities 10,640 19,036
Net decrease in cash and cash equivalents (2,017) (474)
Cash and cash equivalents at beginning of period 7,935 5,530
Cash and cash equivalents at end of period 5,918 5,056
Supplemental cash flow information:    
Financing costs included in accounts payable and accrued expenses $ 0 $ 5