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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net income (loss) $ 4,854 $ (387)
Adjustments required to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 4,574 4,976
Stock-based compensation expense 619 592
Decrease (increase) in trade and other receivables, net (9,288) 30,503
Decrease (increase) in inventory, net of write off (10,555) 1,603
Decrease in deferred tax asset, net 140 1,205
Increase (decrease) in trade payables and accrued liabilities 18,775 (18,445)
Increase (decrease) in deferred revenues 1,018 (4,934)
Other adjustments (88) (108)
Net cash provided by operating activities 10,049 15,005
Cash flows from investing activities:    
Purchase of property and equipment (3,505) (3,608)
Investment in short-term bank deposits (153)
Net cash used in investing activities (3,505) (3,761)
Cash flows from financing activities:    
Proceeds from share options exercise 189 7
Repayment of bank loans (9,000) (13,472)
Net cash used in financing activities (8,811) (13,465)
Effect of exchange rate changes on cash 16 280
Decrease in cash and cash equivalents (2,251) (1,941)
Cash and cash equivalents at the beginning of the period 36,338 36,318
Cash and cash equivalents at the end of the period $ 34,087 $ 34,377