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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Income Statement [Abstract]    
Total revenues $ 10,796us-gaap_Revenues $ 10,329us-gaap_Revenues
Cost of revenues 5,386us-gaap_CostOfRevenue 5,274us-gaap_CostOfRevenue
Gross profit 5,410us-gaap_GrossProfit 5,055us-gaap_GrossProfit
Operating expenses:    
Research and development 1,281us-gaap_ResearchAndDevelopmentExpense 1,194us-gaap_ResearchAndDevelopmentExpense
Sales and marketing 2,071us-gaap_SellingAndMarketingExpense 1,748us-gaap_SellingAndMarketingExpense
General and administrative 1,655us-gaap_GeneralAndAdministrativeExpense 1,516us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 5,007us-gaap_OperatingExpenses 4,458us-gaap_OperatingExpenses
Income from operations 403us-gaap_OperatingIncomeLoss 597us-gaap_OperatingIncomeLoss
Other expense, net 7us-gaap_NonoperatingIncomeExpense 97us-gaap_NonoperatingIncomeExpense
Income from operations before provision for income taxes 396us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 500us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes 150us-gaap_IncomeTaxExpenseBenefit 13us-gaap_IncomeTaxExpenseBenefit
Net income $ 246us-gaap_NetIncomeLoss $ 487us-gaap_NetIncomeLoss
Net income per share:    
Basic $ 0.02us-gaap_EarningsPerShareBasic $ 0.05us-gaap_EarningsPerShareBasic
Diluted $ 0.02us-gaap_EarningsPerShareDiluted $ 0.05us-gaap_EarningsPerShareDiluted
Weighted average shares used in computing net income per common share    
Basic 9,868us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 9,963us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 10,108us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 10,526us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding