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Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Income Statement [Abstract]
Total revenues	$ 42,814us-gaap_Revenues	$ 38,273us-gaap_Revenues	$ 33,859us-gaap_Revenues
Cost of revenues	21,409us-gaap_CostOfRevenue	19,686us-gaap_CostOfRevenue	17,513us-gaap_CostOfRevenue
Gross profit	21,405us-gaap_GrossProfit	18,587us-gaap_GrossProfit	16,346us-gaap_GrossProfit
Operating expenses:
Research and development	4,629us-gaap_ResearchAndDevelopmentExpense	3,684us-gaap_ResearchAndDevelopmentExpense	4,385us-gaap_ResearchAndDevelopmentExpense
Sales and marketing	8,155us-gaap_SellingAndMarketingExpense	7,720us-gaap_SellingAndMarketingExpense	7,895us-gaap_SellingAndMarketingExpense
General and administrative	6,034us-gaap_GeneralAndAdministrativeExpense	5,023us-gaap_GeneralAndAdministrativeExpense	4,926us-gaap_GeneralAndAdministrativeExpense
Proceeds from demutualization of insurance carrier		(473)us-gaap_InsuranceRecoveries
Total operating expenses	18,818us-gaap_OperatingExpenses	15,954us-gaap_OperatingExpenses	17,206us-gaap_OperatingExpenses
Income (loss) from continuing operations	2,587us-gaap_OperatingIncomeLoss	2,633us-gaap_OperatingIncomeLoss	(860)us-gaap_OperatingIncomeLoss
Legal settlement			800us-gaap_LitigationSettlementAmount
Interest and other expense, net	(1,255)us-gaap_InterestIncomeExpenseNonoperatingNet	(371)us-gaap_InterestIncomeExpenseNonoperatingNet	(210)us-gaap_InterestIncomeExpenseNonoperatingNet
Income (loss) from continuing operations before (benefit from) provision for income taxes	1,332us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	2,262us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	(270)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
(Benefit from) provision for income taxes	(8,706)us-gaap_IncomeTaxExpenseBenefit	31us-gaap_IncomeTaxExpenseBenefit	(100)us-gaap_IncomeTaxExpenseBenefit
Income (loss) from continuing operations, net of tax	10,038us-gaap_IncomeLossFromContinuingOperations	2,231us-gaap_IncomeLossFromContinuingOperations	(170)us-gaap_IncomeLossFromContinuingOperations
Income (loss) from discontinued operations, net of tax			(264)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
Gain on sale of discontinued operations, net of tax			1,872us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Income from discontinued operations, net of tax			1,608us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income	$ 10,038us-gaap_NetIncomeLoss	$ 2,231us-gaap_NetIncomeLoss	$ 1,438us-gaap_NetIncomeLoss
Basic -
Continuing operations	$ 1.01us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.24us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (0.02)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued operations	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ 0.18us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net income	$ 1.01us-gaap_EarningsPerShareBasic	$ 0.24us-gaap_EarningsPerShareBasic	$ 0.16us-gaap_EarningsPerShareBasic
Diluted -
Continuing operations	$ 0.97us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.22us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ (0.02)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued operations	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ 0.18us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net income	$ 0.97us-gaap_EarningsPerShareDiluted	$ 0.22us-gaap_EarningsPerShareDiluted	$ 0.16us-gaap_EarningsPerShareDiluted
Weighted average shares used in computing net income per common share - basic	9,892us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	9,245us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,935us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average shares used in computing net income per common share - diluted	10,357us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	10,104us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	8,935us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

X

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The aggregate cost of goods produced and sold and services rendered during the reporting period.

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