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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities    
Net (loss) $ (14,010) $ (18,138)
Adjustments required to reflect net cash used in operating activities:    
Depreciation 421 364
Non-cash operating lease expenses 434 411
Share-based compensation 1,144 1,485
Loss on marketable securities and short-term bank deposits 1,626 4,886
Changes in operating asset and liability items:    
Increase in prepaid expenses and other receivables (169) (205)
Decrease in accounts payable trade (240) (211)
Decrease in accrued expenses and other liabilities (1,389) (307)
Operating lease liabilities (624) (827)
Net cash used in operating activities (12,807) (12,542)
Cash flows from investing activities    
Purchase of property and equipment (200) (4,351)
Proceeds from sale of property and equipment 82
Investment in short-term interest bearing bank deposits (34,218) (35,234)
Release of short-term interest bearing bank deposits 288  
Purchases of marketable securities (1,608)
Proceeds from sales of marketable securities 62,549
Net cash (used in) provided by investing activities (34,048) 21,356
Cash flows from financing activities    
Proceeds from issuance of shares, net 360
Proceeds from exercise of options 100
Net cash provided by financing activities 360 100
Increase (decrease) in cash and cash equivalents (46,495) 8,914
Cash and cash equivalents - beginning of period 50,357 11,636
Cash and cash equivalents - end of period 3,862 20,550
Supplemental disclosures of cash flow information:    
Cash paid for taxes
Cash paid (received) for interest, net $ 233 $ 45