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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Operating activities:    
Net loss $ (13,168) $ (11,313)
Adjustments to reconcile net loss to net cash flows used in operating activities:    
Depreciation and amortization 102 76
Unrealized gain from marketable securities (12)
Loss on disposal of property and equipment 5
Share-based compensation expense 1,752 1,386
Changes in assets and liabilities:    
Prepaid expenses and other assets 13 177
Other payables and accrued liabilities (241) 320
Net cash flows used in operating activities (11,549) (9,354)
Investing activities:    
Short-term deposit (3)
Purchase of property and equipment (84) (69)
Proceeds from sale of investment 270
Purchase of marketable securities (3,749)
Proceeds from sales of marketable security 2,999
Net cash flows provided by (used in) investing activities (3,836) 3,200
Financing activities:    
Issuance of common stock and warrants net of issuance costs 4,324
Net cash flows provided by financing activities 4,324
Decrease in cash, cash equivalents and restricted cash (11,061) (6,154)
Cash, cash equivalents and restricted cash at beginning of period 13,580 19,734
Cash, cash equivalents and restricted cash at ending of period 2,519 13,580
Supplemental disclosure of cash flow information:    
Cash received from interest 51 1
Right-of-use assets and lease liability $ 103 $ 69