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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Revenue:    
Product $ 160,843us-gaap_SalesRevenueGoodsNet $ 124,242us-gaap_SalesRevenueGoodsNet
Services 26,019us-gaap_SalesRevenueServicesNet 18,573us-gaap_SalesRevenueServicesNet
Total revenue 186,862us-gaap_Revenues 142,815us-gaap_Revenues
Cost of revenue:    
Cost of product 89,506us-gaap_CostOfGoodsSold 78,438us-gaap_CostOfGoodsSold
Cost of services 9,244us-gaap_CostOfServices 5,971us-gaap_CostOfServices
Total cost of revenue 98,750us-gaap_CostOfRevenue 84,409us-gaap_CostOfRevenue
Gross profit 88,112us-gaap_GrossProfit 58,406us-gaap_GrossProfit
Operating expenses:    
Research and development 39,257us-gaap_ResearchAndDevelopmentExpense 29,346us-gaap_ResearchAndDevelopmentExpense
Sales and marketing 21,042us-gaap_SellingAndMarketingExpense 17,862us-gaap_SellingAndMarketingExpense
General and administrative 12,656us-gaap_GeneralAndAdministrativeExpense 12,254us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 72,955us-gaap_OperatingExpenses 59,462us-gaap_OperatingExpenses
Income (loss) from operations 15,157us-gaap_OperatingIncomeLoss (1,056)us-gaap_OperatingIncomeLoss
Other income (expense), net:    
Interest income 414us-gaap_InvestmentIncomeInterest 336us-gaap_InvestmentIncomeInterest
Interest expense (2,890)us-gaap_InterestExpense (2,677)us-gaap_InterestExpense
Other gain (loss), net 301us-gaap_OtherNonoperatingIncomeExpense (729)us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense), net (2,175)us-gaap_NonoperatingIncomeExpense (3,070)us-gaap_NonoperatingIncomeExpense
Income (loss) before income taxes 12,982us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (4,126)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes 616us-gaap_IncomeTaxExpenseBenefit 248us-gaap_IncomeTaxExpenseBenefit
Net income (loss) $ 12,366us-gaap_NetIncomeLoss $ (4,374)us-gaap_NetIncomeLoss
Net income (loss) per common share:    
Basic (in usd per share) $ 0.10us-gaap_EarningsPerShareBasic $ (0.04)us-gaap_EarningsPerShareBasic
Diluted (in usd per share) $ 0.09us-gaap_EarningsPerShareDiluted $ (0.04)us-gaap_EarningsPerShareDiluted
Weighted average shares used in computing net income (loss) per common share:    
Basic weighted average common shares outstanding (in shares) 127,840us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 121,352us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted weighted average common shares outstanding (in shares) 137,304us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 121,352us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding