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Goodwill and Intangible Assets - Summary of Components of Gross and Net Intangible Asset (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Apr. 04, 2015 | Jan. 03, 2015
Schedule of Intangible Assets |  |  |
Gross Carrying Amount | $ 960 us-gaap_FiniteLivedIntangibleAssetsGross | $ 960 us-gaap_FiniteLivedIntangibleAssetsGross |
Accumulated Amortization | 680 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | 676 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Net Carrying Amount | 280 us-gaap_FiniteLivedIntangibleAssetsNet | 284 us-gaap_FiniteLivedIntangibleAssetsNet | [1]
Patents |  |  |
Schedule of Intangible Assets |  |  |
Gross Carrying Amount | 720 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | 720 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |
Accumulated Amortization | 600 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | 600 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |
Net Carrying Amount | 120 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | 120 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |
Remaining Amortization Period | Varies |  |
Customer Relations |  |  |
Schedule of Intangible Assets |  |  |
Gross Carrying Amount | 240 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 240 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Accumulated Amortization | 80 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 76 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Net Carrying Amount | $ 160 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | $ 164 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Useful Lives | 10 years |  |
[1] | Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended January 3, 2015.

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