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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities |  |  |
Net income | $ 10,236 | $ 14,637 | $ 21,714
Adjustments required to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 1,997 | 3,293 | 3,799
Write-down of obsolete inventory | 2,106 | 6,211 | 2,918
Discount on marketable securities, net | 144 | 32 | 217
Share-based compensation expense | 2,355 | 2,424 | 2,425
Deferred taxes, net | (699) | 5 | 453
Changes in assets and liabilities: |  |  |
Accounts receivable - trade | (1,441) | 16,985 | (13,237)
Accounts receivable - other | 4,385 | (3,384) | (2,475)
Accounts receivable - related parties | 364 | 261 | (208)
Change in liability for employees' severance benefits, net | 175 | (79) | 171
Inventories | 3,529 | 2,540 | (10,287)
Trade accounts payable | 769 | 3,059 | 1,698
Other accounts payable and accrued expenses | 2,824 | (314) | (1,144)
Contingent consideration benefit |  |  | (4,642)
Accounts payable - related parties | (18) | 8 | 6
Net cash provided by operating activities | 26,726 | 45,678 | 1,408
Cash flows from investing activities |  |  |
Investment in short-term bank deposits, net | (13,542) |  |
Purchase of property, plant and equipment | (1,441) | (1,345) | (1,690)
Investment in intangible assets | (1,018) | (1,022) | (11)
Proceeds from maturity of marketable securities | 1,997 | 7,750 | 16,175
Purchases of marketable securities | (15,604) | (41,670) | (5,961)
Net cash provided by (used in) investing activities | (29,608) | (36,287) | 8,513
Cash flows from financing activities |  |  |
Exercise of options | 154 | 288 | 2,651
Dividend |  |  | (7,382)
Purchase of treasury shares | (7,971) |  |
Net cash provided by (used in) financing activities | (7,817) | 288 | (4,731)
Effect of exchange rate changes on cash balances held | 360 | 108 | (86)
Increase (decrease) in cash and cash equivalents | (10,339) | 9,787 | 5,104
Cash and cash equivalents at beginning of year | 26,808 | 17,021 | 11,917
Cash and cash equivalents at end of year | 16,469 | 26,808 | 17,021
Supplementary cash flow information Non-cash transactions: |  |  |
Investments in property, plant and equipment | 97 | 146 | 119
Supplementary cash flow information Cash paid during the year for: |  |  |
Income taxes | $ 1,103 | $ 3,260 | $ 4,584

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- Definition Amount of cash outflow through purchase of long-term held-to-maturity securities. + 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 (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562 + Details
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- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + 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=118932676&loc=d3e3213-108585 + Details
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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=118932676&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity. + 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 (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562 + 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=116856206&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=118932676&loc=d3e3255-108585 + 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=118932676&loc=d3e3602-108585 + Details
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