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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net income (loss) $ 21,337 $ 9,634 $ (5,936)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 10,299 9,052 9,794
Stock based compensation 5,458 5,493 4,041
Amortization of premiums, accretion of discounts and accrued interest on available-for-sale marketable securities, net 3,652 1,877 1,765
Accrued interest on bank deposits (243) (137) (130)
Accrued severance pay, net (59) (591) (703)
Decrease (increase) in deferred income taxes, net (1,358) (5) 1
Decrease (increase) in trade receivables, net 3,978 60 (3,255)
Decrease (increase) in other current assets and prepaid expenses 365 (468) (888)
Decrease (increase) in inventories (2,425) 70 (561)
Increase (decrease) in trade payables (814) 214 1,053
Increase in deferred revenues 977 13,358 8,807
Increase in other payables and accrued expenses 1,613 2,409 1,338
Excess tax benefit from stock-based compensation (790)   (899)
Net cash provided by operating activities 41,990 40,966 14,427
Cash flows from investing activities:      
Purchase of property and equipment (5,734) (5,650) (5,837)
Investment in other long-term assets (35) (88) (36)
Investment in bank deposits (32,089) (21,174) (35,000)
Purchase of available-for-sale marketable securities (68,777) (75,814) (405,827)
Proceeds from redemption and maturity of available-for-sale marketable securities 57,423 37,201 440,575
Payment for the acquisition of Intangible assets   (1,200)  
Payment for the acquisition of Alteon     (18,022)
Net cash used in investing activities (49,212) (66,725) (24,147)
Cash flows from financing activities:      
Proceeds from exercise of stock options 8,534 21,200 1,018
Excess tax benefit from stock-based compensation 790   899
Repurchase of shares     (419)
Net cash provided by financing activities 9,324 21,200 1,498
Increase (decrease) in cash and cash equivalents 2,102 (4,559) (8,222)
Cash and cash equivalents at the beginning of the year 15,284 19,843 28,065
Cash and cash equivalents at the end of the year 17,386 15,284 19,843
Supplemental disclosure of cash flow information:      
Cash paid during the year for income taxes $ 847 $ 719 $ 383