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Stockholders' Equity (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 02, 2015	Jan. 03, 2014	Dec. 28, 2012
Schedule of Employee Service Share-based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	$ 4,663us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1	$ 4,489us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1	$ 3,208us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
General and administrative [Member]
Schedule of Employee Service Share-based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	2,660us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	2,663us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	2,231us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember
Marketing and selling [Member]
Schedule of Employee Service Share-based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	1,065us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember	1,167us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember	545us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember
Research and development [Member]
Schedule of Employee Service Share-based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	$ 938us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	$ 659us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	$ 432us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember

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Amount of capitalized and expensed compensation cost from equity-based compensation arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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