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Interim Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating activities:    
Net loss $ (2,853) $ (3,189)
Adjustments to reconcile net loss to net cash flows used in operating activities:    
Depreciation and amortization 25 21
Non-cash and accrued interest 1
Interest income and unrealized gains from marketable securities (27)
Share-based compensation expense 412 429
Changes in assets and liabilities:    
Prepaid expenses and other assets 140 177
Other payables and accrued liabilities (900) (446)
Net cash flows used in operating activities (3,203) (3,007)
Investing activities:    
Purchases of property and equipment (16)
Purchase of a marketable security (638)
Proceeds from sale of a marketable security 1,000
Proceeds from maturities of marketable securities 2,518
Short term deposit 3
Net cash flows provided by (used in) investing activities 2,883 (16)
Decrease in cash, cash equivalents and restricted cash (320) (3,023)
Cash, cash equivalents and restricted cash at beginning of period 2,519 13,580
Cash, cash equivalents and restricted cash at end of period 2,199 10,557
Supplemental disclosure of cash flow information:    
Cash received from interest 35
Right-of-use asset and lease liability $ 12 $ 121