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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating activities:    
Net loss $ (9,169) $ (7,247)
Adjustments to reconcile net loss to net cash flows from operating activities:    
Depreciation and amortization 68 84
Capital gains from sales of property and equipment (96)
Unrealized gain from convertible loan (61)
Non cash and accrued interest (9) (25)
Share-based compensation expense 1,937 1,099
Changes in assets and liabilities:    
Prepaid expenses and other assets 222 (126)
Other payables and accrued liabilities (240) (140)
Net cash flows used in operating activities (7,252) (6,451)
Investing activities:    
Purchase of property and equipment (91) (216)
Investment in a convertible loan (200)
Sales of property and equipment 259
Proceeds from sales of marketable securities 2,521
Purchase of marketable securities (4,998) (2,496)
Net cash flows used in investing activities (2,768) (2,453)
Financing activities:    
Issuance of common stock and warrants, net of issuance costs 36,770
Repayment of shareholders investment (3,375)
Net cash flows (used in) provided by financing activities (3,375) 36,770
(Decrease) increase in cash, cash equivalents and restricted cash (13,395) 27,866
Cash, cash equivalents and restricted cash at beginning of period 33,129 5,263
Cash, cash equivalents and restricted cash at ending of period 19,734 33,129
Non-cash activities:    
Right-of-use assets obtained in exchange for new operating lease obligations 966
Supplemental disclosure of cash flow information:    
Interest paid from litigation 236
Cash received from interest 32 97
Financing fees included in other receivable $ 412