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Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 28, 2015	Mar. 29, 2014
Total revenue	$ 117,961us-gaap_SalesRevenueNet	$ 114,204us-gaap_SalesRevenueNet
Total cost of revenue	64,253us-gaap_CostOfGoodsAndServicesSold	62,494us-gaap_CostOfGoodsAndServicesSold
Gross margin	53,708us-gaap_GrossProfit	51,710us-gaap_GrossProfit
Operating expenses:
Research and development	19,032us-gaap_ResearchAndDevelopmentExpense	16,934us-gaap_ResearchAndDevelopmentExpense
Selling and marketing	14,188us-gaap_SellingAndMarketingExpense	14,532us-gaap_SellingAndMarketingExpense
General and administrative	12,589us-gaap_GeneralAndAdministrativeExpense	12,264us-gaap_GeneralAndAdministrativeExpense
Total operating expenses	45,809us-gaap_OperatingExpenses	43,730us-gaap_OperatingExpenses
Operating income	7,899us-gaap_OperatingIncomeLoss	7,980us-gaap_OperatingIncomeLoss
Other income (expense), net	(794)us-gaap_NonoperatingIncomeExpense	(187)us-gaap_NonoperatingIncomeExpense
Income before income taxes	7,105us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	7,793us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense	2,351us-gaap_IncomeTaxExpenseBenefit	2,513us-gaap_IncomeTaxExpenseBenefit
Net income	4,754us-gaap_NetIncomeLoss	5,280us-gaap_NetIncomeLoss
Net income per share
Basic, in dollars per share	$ 0.16us-gaap_EarningsPerShareBasic	$ 0.18us-gaap_EarningsPerShareBasic
Diluted, in dollars per share	$ 0.16us-gaap_EarningsPerShareDiluted	$ 0.18us-gaap_EarningsPerShareDiluted
Number of shares used in calculations per share
Basic, in shares	29,653us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	29,189us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted, in shares	30,230us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	30,033us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Stock-based compensation	3,107us-gaap_ShareBasedCompensation	3,078us-gaap_ShareBasedCompensation
Cost of Sales [Member]
Number of shares used in calculations per share
Stock-based compensation	215us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	169us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Research and development
Number of shares used in calculations per share
Stock-based compensation	832us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	731us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember
Selling and marketing
Number of shares used in calculations per share
Stock-based compensation	309us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember	338us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember
General and administrative
Number of shares used in calculations per share
Stock-based compensation	$ 1,751us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	$ 1,840us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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