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INTERIM CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flow from operating activities:    
Net income (loss) $ (12,357) $ 1,571
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 5,384 4,438
Stock-based compensation expense 867 1,172
Decrease (increase) in trade and other receivables, net 16,962 (10,188)
Decrease (increase) in inventory, net of write off 7,526 (20,813)
Decrease (increase) in deferred tax asset, net (109) 1,236
Increase (decrease) in trade payables and accrued liabilities (8,995) 9,463
Increase in deferred revenues 803 6,150
Other adjustments (288) (136)
Net cash provided by (used in) operating activities 9,793 (7,107)
Cash flow from investing activities:    
Purchase of property and equipment, net (3,638) (6,707)
Purchase of intangible assets (279) (2,792)
Proceeds from bank deposits 920
Net cash used in investing activities (3,917) (8,579)
Cash flow from financing activities:    
Proceeds from exercise of stock options 554 256
Proceeds from bank credits and loans, net 5,079 8,900
Net cash provided by financing activities 5,633 9,156
Translation adjustments on cash and cash equivalents (281) (10)
Increase (decrease) in cash and cash equivalents 11,228 (6,540)
Cash and cash equivalents at the beginning of the period 23,939 35,581
Cash and cash equivalents at the end of the period $ 35,167 $ 29,041