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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Operating activities:    
Net loss $ (11,443) $ (10,740)
Adjustments to reconcile net loss to net cash flows used in operating activities:    
Depreciation of property and equipment 91 106
Loss on legal settlement 2,211
Interest income and unrealized gains from marketable securities, net (1) (160)
Loss on disposal of property and equipment 2
Share-based compensation 1,349 1,394
Changes in assets and liabilities:    
Prepaid expenses and other assets 69 672
Other payables and accrued liabilities 873 (683)
Insurance recovery related to legal settlement and legal expenses received in cash 1,335 (1,335)
Legal settlement paid in cash (1,100)
Net cash flows used in operating activities (8,827) (8,533)
Investing activities:    
Short-term deposit 3
Purchase of property and equipment (25) (33)
Proceeds from maturities of marketable securities 2,500 9,164
Purchase of marketable securities (5,120) (10,060)
Proceeds from sales of marketable securities 4,182 2,899
Net cash flows provided by investing activities 1,537 1,973
Financing activities:    
Issuance of common stock and warrants, net of issuance costs 7,936 6,558
Net cash flows provided by financing activities 7,936 6,558
Increase (decrease) in cash, cash equivalents and restricted cash 646 (2)
Cash, cash equivalents and restricted cash at beginning of year 2,517 2,519
Cash, cash equivalents and restricted cash at ending of year 3,163 2,517
Supplemental disclosure of cash flow information:    
Cash received from interest 171 130
Legal settlement settled through issuance of common stock 1,111
Right-of-use assets obtained in exchange for lease liabilities 98 50
Accrued bonus settled through grant of stock-option awards $ 76