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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 | $ (9,348) | $ (8,659) | $ (10,415)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 4,312 | 4,359 | 3,834
Stock-based compensation | 5,198 | 3,420 | 2,862
Capital loss | 18 |  | 39
Increase (decrease) in accrued severance pay, net | 128 | (54) | 16
Decrease (increase) in other assets | (2,048) | (326) | 535
Decrease in accrued interest and amortization of premium on available-for sale marketable securities | 357 | 343 | 804
Decrease (increase) in operating lease right-of-use asset | 1,910 | (6,368) |
Increase (decrease) in operating leases liability | (2,323) | 6,971 |
Decrease (increase) in trade receivables | 8,323 | (2,915) | (3,356)
Increase in other receivables and prepaid expenses | (7,272) | (3,168) | (1,101)
Increase in inventories | (1,918) | (253) | (3,448)
Decrease (increase) in long-term deferred taxes, net | 96 | (236) | 20
Increase (decrease) in trade payables | (9,584) | 3,863 | 1,945
Increase (decrease) in employees and payroll accruals | 2,047 | 4,635 | (1,178)
Increase (decrease) in deferred revenues | (5,182) | 23,520 | 3,566
Increase (decrease) in other payables and accrued expenses | 3,061 | (9,040) | 6,906
Net cash provided by (used in) operating activities | (12,225) | 16,092 | 1,029
Cash flows from investing activities: |  |  |
Decrease (increase) in restricted deposits | 32,896 | (33,374) | (294)
Redemption of (Investment in) short-term deposits | (41,883) | 16,986 | 8,500
Purchase of property and equipment | (7,582) | (3,708) | (3,485)
Investment in available-for sale marketable securities | (1,219) | (39,950) | (34,777)
Proceeds from sales and maturity of available-for sale marketable securities | 34,847 | 43,555 | 32,651
Acquisition of Netonomy, net of cash |  |  | (3,048)
Net cash provided by (used in) investing activities | 17,059 | (16,491) | (453)
Cash flows from financing activities: |  |  |
Proceeds from exercise of stock options | 1,835 | 993 | 418
Net cash provided by financing activities | 1,835 | 993 | 418
Increase in cash and cash equivalents | 6,669 | 594 | 994
Cash and cash equivalents at the beginning of the year | 16,930 | 16,336 | 15,342
Cash and cash equivalents at the end of the year | 23,599 | 16,930 | 16,336
Cash paid during the year for: |  |  |
Taxes | 410 | 473 | $ 347
Non-cash activity: |  |  |
Right-of-use assets obtained in the exchange for operating lease liabilities | $ 1,080 | $ 1,208 |

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