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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:        
Net loss $ (3,979) $ (3,614) $ (7,937) $ (5,274)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:        
Depreciation 1,141 897 2,229 1,685
Stock-based compensation 2,261 1,232 3,705 2,156
Amortization of intangible assets 234 152 471 304
Increase (decrease) in accrued severance pay, net 12 (1) (60) 0
Decrease (increase) in other assets (458) (1) 1,041 159
Decrease in accrued interest and amortization of premium on marketable securities 32 57 107 228
Changes in operating leases, net (479) 544 (711) (167)
Decrease (increase) in trade receivables (3,113) 1,616 (10,256) 7,484
Decrease (Increase) in other receivables and prepaid expenses 3,094 (518) 3,522 (919)
Decrease (Increase) in inventories 4,246 (2,113) 3,289 (6,598)
Decrease in long-term deferred taxes, net 103 20 175 104
Increase (Decrease) in trade payables 334 (6,468) (536) (4,200)
Increase (decrease) in employees and payroll accruals 1,286 1,024 (623) (301)
Increase (decrease) in deferred revenues 1,640 4,169 16,612 (1,457)
Increase (Decrease) in other payables, accrued expenses and other long term liabilities (2,761) 2,235 (3,364) 517
Net cash provided by (used in) operating activities 3,593 (769) 7,664 (6,279)
Cash flows from investing activities:        
Decrease (increase) in restricted deposit (2,440) 9,002 (2,874) 10,502
Redemption of (Investment in) short-term deposits 100 (14,200) (24,200) (9,443)
Purchase of property and equipment (1,934) (2,345) (3,629) (3,696)
Investment in available-for sale marketable securities 0 0 0 (375)
Proceeds from sales and maturity of available-for sale marketable securities 3,231 8,523 7,579 21,446
Net cash provided by (used in) investing activities (1,043) 980 (23,124) 18,434
Cash flows from financing activities:        
Proceeds from exercise of stock options 908 837 2,467 1,457
Net cash provided by financing activities 908 837 2,467 1,457
Increase (Decrease) in cash and cash equivalents 3,458 1,048 (12,993) 13,612
Cash and cash equivalents at the beginning of the period 7,148 29,494 23,599 16,930
Cash and cash equivalents at the end of the period $ 10,606 $ 30,542 $ 10,606 $ 30,542