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Interim Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Operating activities:    
Net loss $ (4,899) $ (4,060)
Adjustments to reconcile net loss to net cash flows from operating activities:    
Depreciation and amortization 32 34
Non-cash and accrued interest (1)
Share-based compensation expense 709 909
Changes in assets and liabilities:    
Prepaid expenses and other assets 92 122
Other payables and accrued liabilities (224) (693)
Net cash flows from operating activities (4,291) (3,688)
Investing activities:    
Purchase of property and equipment (11) (76)
Investment in convertible loan (200)
Proceeds from sales of investment 270
Proceeds from sales of marketable security 2,521
Net cash flows from investing activities 259 2,245
Financing activities:    
Repayment of shareholders investment (3,375)
Net cash flows from financing activities (3,375)
Decrease in cash, cash equivalents and restricted cash (4,032) (4,818)
Cash, cash equivalents and restricted cash at beginning of period 19,734 33,129
Cash, cash equivalents and restricted cash at ending of period 15,702 28,311
Supplemental disclosure of cash flow information:    
Interest paid from litigation 236
Cash received from interest $ 2 $ 8