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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

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121583591&loc=SL98516268-108586 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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