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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
CONSOLIDATED STATEMENTS OF OPERATIONS      
Total revenues $ 390,436us-gaap_SalesRevenueNet $ 500,275us-gaap_SalesRevenueNet $ 259,251us-gaap_SalesRevenueNet
Cost of revenues 134,282us-gaap_CostOfRevenue 157,736us-gaap_CostOfRevenue 91,988us-gaap_CostOfRevenue
Gross profit 256,154us-gaap_GrossProfit 342,539us-gaap_GrossProfit 167,263us-gaap_GrossProfit
Operating expenses:      
Research and development 169,382us-gaap_ResearchAndDevelopmentExpense 138,310us-gaap_ResearchAndDevelopmentExpense 92,283us-gaap_ResearchAndDevelopmentExpense
Sales and marketing 70,544us-gaap_SellingAndMarketingExpense 60,894us-gaap_SellingAndMarketingExpense 40,294us-gaap_SellingAndMarketingExpense
General and administrative 37,046us-gaap_GeneralAndAdministrativeExpense 24,456us-gaap_GeneralAndAdministrativeExpense 21,736us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 276,972us-gaap_OperatingExpenses 223,660us-gaap_OperatingExpenses 154,313us-gaap_OperatingExpenses
Income (loss) from operations (20,818)us-gaap_OperatingIncomeLoss 118,879us-gaap_OperatingIncomeLoss 12,950us-gaap_OperatingIncomeLoss
Other income, net 1,228us-gaap_NonoperatingIncomeExpense 1,259us-gaap_NonoperatingIncomeExpense 759us-gaap_NonoperatingIncomeExpense
Income (loss) before taxes on income (19,590)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 120,138us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 13,709us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for taxes on income (3,752)us-gaap_IncomeTaxExpenseBenefit (8,187)us-gaap_IncomeTaxExpenseBenefit (3,375)us-gaap_IncomeTaxExpenseBenefit
Net income (loss) $ (23,342)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 111,951us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 10,334us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net income (loss) per share - basic (in dollars per share) $ (0.54)us-gaap_EarningsPerShareBasic $ 2.71us-gaap_EarningsPerShareBasic $ 0.29us-gaap_EarningsPerShareBasic
Net income (loss) per share - diluted (in dollars per share) $ (0.54)us-gaap_EarningsPerShareDiluted $ 2.55us-gaap_EarningsPerShareDiluted $ 0.27us-gaap_EarningsPerShareDiluted
Shares used in computing income (loss) per share:      
Basic (in shares) 43,421us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 41,308us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 36,263us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 43,421us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 43,901us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 38,562us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding