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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 income (loss) $ (17,092) $ (2,344) $ 23,046
Adjustments required to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Depreciation and amortization 12,861 9,691 7,758
Share-based compensation expense 1,662 2,053 1,980
Decrease (increase) in accrued severance pay and pensions, net 488 271 (11)
Decrease (increase) in trade receivables, net 9,345 4,533 (11,098)
Decrease (increase) in other accounts receivable and prepaid expenses (including other long-term assets) (6,661) (2,086) 4,624
Decrease in operating lease right-of-use assets 5,121 5,348
Decrease (increase) in inventories 9,919 (9,475) (956)
Increase (decrease) in trade payables 1,953 (15,933) 2,340
Increase (decrease) in deferred revenues 2,988 4,150 (650)
Increase in deferred tax assets, net (173) (258) (6,601)
Decrease in operating lease liability (5,112) (5,114)
Increase (decrease) in other accounts payable and accrued expenses (including other long-term liabilities) 1,946 (3,767) 2,062
Net cash provided by (used in) operating activities 17,245 (12,931) 22,494
Cash flows from investing activities:      
Purchase of property and equipment, net (6,077) (11,592) (10,303)
Purchase of intangible assets, net (412) (3,274) (3,412)
Proceeds from bank deposits 1,002 48
Investment in shares (1,628)
Net cash used in investing activities (6,489) (13,864) (15,295)
Cash flows from financing activities:      
Proceeds from (repayment of) bank credits and loans, net (8,621) 14,600
Proceeds from exercise of stock options 1,237 602 2,611
Net cash provided by (used in) financing activities (7,384) 15,202 2,611
Translation adjustments on cash and cash equivalents (210) (49) (106)
Increase (decrease) in cash and cash equivalents 3,162 (11,642) 9,704
Cash and cash equivalents at the beginning of the year 23,939 35,581 25,877
Cash and cash equivalents at the end of the year 27,101 23,939 35,581
Supplemental disclosure of cash flow information:      
Cash paid for income taxes 3,003 3,833 1,617
Cash paid for interest on bank loans $ 1,137 $ 1,796 $ 1,752