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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net income (loss) $ (8,659) $ 18,569 $ 24,950
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 10,372 9,401 8,102
Stock based compensation 11,520 9,329 7,382
Gain from sale of available-for-sale marketable securities (1,771) (2,438) (424)
Amortization of premiums, accretion of discounts and accrued interest on available-for-sale marketable securities, net 1,949 3,208 2,964
Accrued interest on bank deposits 1,179 (1,998) 1,069
Increase (decrease) in accrued severance pay, net 401 125 (158)
Changes in deferred income taxes, net (2,687) 215 (1,775)
Decrease (increase) in trade receivables, net 7,003 (773) (726)
Decrease (increase) in other current assets and prepaid expenses 883 (103) (1,913)
Decrease (increase) in inventories (792) 522 (2,654)
Increase (decrease) in trade payables (3,284) (562) 1,019
Increase in deferred revenues (short-term and long-term) 12,964 3,849 8,638
Increase in other payables and accrued expenses and other long-term liabilities 8,855 424 7,146
Excess tax deficiency (benefit) from stock-based compensation stock options 547 (632) (1,443)
Net cash provided by operating activities 38,480 39,136 52,177
Cash flows from investing activities:      
Purchase of property and equipment (9,404) (13,774) (9,482)
Proceeds from (investment in) other long-term assets (53) (100) 34
Proceeds from (investment in) bank deposits, net 31,295 (33,824) (20,929)
Purchase of available-for-sale marketable securities (16,219) (13,442) (44,063)
Proceeds from maturity of available-for-sale marketable securities 17,205 26,530 29,390
Proceeds from redemption of available-for-sale marketable securities 5,535 27,757 10,393
Purchase of an intangible asset (1,375)
Net cash provided by (used in) investing activities 28,359 (6,853) (36,032)
Cash flows from financing activities:      
Proceeds from exercise of stock options 1,583 8,746 22,493
Excess tax (deficiency) benefit from stock-based compensation (547) 632 1,443
Repurchase of Ordinary shares (21,980) (52,896) (15,169)
Net cash provided by (used in) financing activities (20,944) (43,518) 8,767
Increase (decrease) in cash and cash equivalents 45,895 (11,235) 24,912
Cash and cash equivalents at the beginning of the year 33,744 44,979 20,067
Cash and cash equivalents at the end of the year 79,639 33,744 44,979
Supplemental disclosure of cash flow information:      
Cash paid during the year for income taxes $ 1,730 $ 1,853 $ 2,285