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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:      
Net loss $ (29,698) $ (27,337) $ (22,599)
Adjustments required to reconcile net loss to net cash used in operating activities:      
Stock-based compensation 2,772 2,408 2,166
Depreciation 715 989 1,394
Increase (decrease) in Severance pay, net 184 (22) 46
Loss (gain) from property and equipment sales and disposals (12) (135) 52
Decrease (increase) in interest receivables from short-term bank deposits (532) 66 (288)
Increase in trade receivables (2,000)
Increase in other accounts receivable and prepaid expenses (1,613) (142) (179)
Decrease (increase) in long-term prepaid expenses (1,187) 83 (666)
Decrease in operating lease right of use asset 475 2,165
Increase (decrease) in trade payables and other accounts payable and accrued expenses 3,817 (3,502) 2,691
Increase (decrease) in deferred participation in R&D expenses (829) (627) 4,092
Decrease in operating lease liability (412) (1,834)
Net cash used in operating activities (28,320) (27,888) (13,291)
Cash flows from investing activities:      
Proceeds from maturity of short-term bank deposits 70,300 59,403 27,400
Investment in short-term bank deposits (152,350) (54,300) (62,403)
Purchase of property and equipment (166) (155) (158)
Proceeds from sale of property and equipment 44 382 2
Net cash provided by (used in) investing activities (82,172) 5,330 (35,159)
Cash flows from financing activities:      
Proceeds from issuance of ordinary shares, net 74,147 22,758 27,711
Proceeds from exercise of warrants 18,325
Proceeds from exercise of options 15,991 3,173 685
Net cash provided by financing activities 108,463 25,931 28,396
Increase (decrease) in cash, cash equivalents and restricted cash (2,029) 3,373 (20,054)
Cash, cash equivalents and restricted cash at the beginning of the year 9,839 6,466 26,520
Cash and cash equivalents and restricted cash at the end of the year 7,810 9,839 6,466
Supplemental disclosure of non-cash investing and financing activities:      
Change in receivables from foreign currency derivative contracts 17
Purchase of property and equipment 16 47 15
Receivables on account of shares 76
Change In right of use asset and operating lease liability (194) 363
Cash paid (received) during the year for:      
Interest payments received from short-term bank deposits and cash equivalents 1,232 1,002 355
Reconciliation of cash, cash equivalents and restricted cash:      
Cash and cash equivalents 7,143 9,187 5,861
Restricted cash $ 667 $ 652 $ 605