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Interim Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Operating activities:        
Net loss $ (2,371) $ (2,853) $ (10,740) $ (13,168)
Adjustments to reconcile net loss to net cash flows used in operating activities:        
Depreciation of property and equipment 28 25 106 102
Loss on legal settlement     2,211
Insurance recovery related to legal settlement     (1,335)
Interest income and unrealized gains from marketable securities, net (27) (160) (12)
Loss on disposal of property and equipment     2 5
Share-based compensation 453 412 1,394 1,752
Changes in assets and liabilities:        
Prepaid expenses and other assets (389) 140 672 13
Other payables and accrued liabilities (376) (900) (683) (241)
Insurance recovery related to legal settlement and legal expenses received in cash 1,335    
Legal settlement paid in cash (1,100)    
Net cash flows used in operating activities (2,420) (3,203) (8,533) (11,549)
Investing activities:        
Short term deposit 3 3 (3)
Purchases of property and equipment (14) (33) (84)
Proceeds from maturities of marketable securities 2,500 2,518 9,164
Purchases of marketable securities (5,120) (638) (10,060) (3,749)
Proceeds from sales of a marketable securities 1,350 1,000 2,899
Net cash flows provided by (used in) investing activities (1,284) 2,883 1,973 (3,836)
Financing activities:        
Issuance of common stock and warrants, net of issuance costs 2,397 6,558 4,324
Net cash flows provided by financing activities 2,397 6,558 4,324
Decrease in cash, cash equivalents and restricted cash (1,307) (320) (2) (11,061)
Cash, cash equivalents and restricted cash at beginning of period 2,517 2,519 2,519 13,580
Cash, cash equivalents and restricted cash at end of period 1,210 2,199 2,517 2,519
Supplemental disclosure of cash flow information:        
Cash received from interest 40 35 130 51
Right-of-use assets obtained in exchange for lease liabilities 37 12 $ 50 $ 103
Supplemental disclosure of non-cash investing and financing activities:        
Legal settlement settled through issuance of common stock 1,111    
Accrued bonus settled through grant of stock-option awards $ 76