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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities:        
Net loss $ (6,233) $ (3,979) $ (12,360) $ (7,937)
Adjustments to reconcile net income to net cash used in operating activities:        
Depreciation 1,332 1,141 2,746 2,229
Stock-based compensation 2,169 2,261 4,706 3,705
Amortization of intangible assets 235 234 470 471
Increase (Decrease) in accrued severance pay, net 26 12 20 (60)
Decrease (increase) in other assets 19 (458) 436 1,041
Decrease in accrued interest and amortization of premium on marketable securities 16 32 48 107
Changes in operating leases, net (191) (479) (563) (711)
Increase in trade receivables (4,082) (3,113) (4,807) (10,256)
Decrease (Increase) in other receivables and prepaid expenses 141 3,094 (893) 3,522
Decrease (Increase) in inventories 591 4,246 (1,164) 3,289
Decrease in long-term deferred taxes, net 0 103 0 175
Increase (Decrease) in trade payables (1,433) 334 (937) (536)
Increase (decrease) in employees and payroll accruals 523 1,286 (1,963) (623)
Increase in deferred revenues 287 1,640 1,129 16,612
Decrease in other payables, accrued expenses and other long term liabilities (1,252) (2,761) (1,523) (3,364)
Amortization of issuance costs of Convertible debt 49 0 71 0
Net cash provided by (used in) operating activities (7,803) 3,593 (14,584) 7,664
Cash flows from investing activities:        
Decrease (increase) in restricted deposit 260 (2,440) 380 (2,874)
Redemption of (Investment in) short-term deposits 520 100 (25,180) (24,200)
Purchase of property and equipment (1,281) (1,934) (2,556) (3,629)
Proceeds from redemption or sale of available-for sale marketable securities 2,872 3,231 6,030 7,579
Net cash provided by (used in) investing activities 2,371 (1,043) (21,326) (23,124)
Cash flows from financing activities:        
Proceeds from exercise of stock options 15 908 250 2,467
Issuance of convertible debt 0 0 39,404 0
Net cash provided by financing activities 15 908 39,654 2,467
Increase (Decrease) in cash and cash equivalents (5,417) 3,458 3,744 (12,993)
Cash and cash equivalents at the beginning of the period 20,878 7,148 11,717 23,599
Cash and cash equivalents at the end of the period $ 15,461 $ 10,606 $ 15,461 $ 10,606