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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:      
Net loss $ (18,754) $ (33,694) $ (34,203)
Adjustments required to reconcile net loss to net cash used in operating activities:      
Stock-based compensation 3,550 4,328 4,276
Depreciation 476 482 461
Decrease in severance pay, net (50) (81) (101)
Loss (gain) from property and equipment sales and disposals 7 12 (3)
Exchange rate differences loss (gain) on cash balances (129) 393 59
Decrease (increase) in interest receivables from short-term bank deposits 92 (584) 469
Amortization of discount and accrued interest on marketable securities (280) 0 0
Decrease (increase) in trade receivables (61,000) 0 2,000
Decrease (increase) in other accounts receivable and prepaid expenses (112) 3,043 (2,802)
Decrease (increase) in long-term prepaid expenses 666 12 (31)
Decrease in operating lease right of use asset 568 658 525
Increase (decrease) in trade payables and other accounts payable and accrued expenses 3,509 (1,601) 3,367
Increase (decrease) in deferred participation in R&D expenses (325) (6,019) 3,708
Increase in deferred revenues 36,541 0 0
Decrease in operating lease liability (645) (1,062) (416)
Net cash used in operating activities (35,886) (34,113) (22,691)
Cash flows from investing activities:      
Proceeds from maturity of short-term bank deposits 79,242 114,445 136,850
Investment in short-term bank deposits (32,100) (76,900) (129,945)
Proceeds from maturity of marketable securities 10,145 0 0
Investment in marketable securities (21,605) 0 0
Purchase of property and equipment (172) (477) (292)
Costs of disposal of property and equipment 0 (10) 0
Proceeds from sale of property and equipment 0 2 3
Net cash provided by investing activities 35,510 37,060 6,616
Cash flows from financing activities:      
Proceeds from issuance of ordinary shares, net 3,081 0 14,958
Proceeds from exercise of warrants 0 0 425
Proceeds from exercise of stock-based awards 0 353 1,455
Net cash provided by financing activities 3,081 353 16,838
Effect of exchange rate changes on cash 129 (393) (59)
Increase in cash, cash equivalents and restricted cash 2,834 2,907 704
Cash, cash equivalents and restricted cash at the beginning of the year 11,421 8,514 7,810
Cash and cash equivalents and restricted cash at the end of the year 14,255 11,421 8,514
Supplemental disclosure of non-cash investing and financing activities:      
Purchase of property and equipment (5) 117 116
Right-of-use asset obtained in exchange for operating lease liability 71 237 0
Cash received during the year for:      
Interest payments received from short-term bank deposits and cash equivalents 3,052 852 1,364
Reconciliation of cash, cash equivalents and restricted cash:      
Cash and cash equivalents 13,890 11,059 7,801
Restricted cash 365 362 713
Total cash, cash equivalents and restricted cash $ 14,255 $ 11,421 $ 8,514