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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