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	$ 960
Accumulated Amortization	680	676
Net Carrying Amount	280	284	[1]
Patents
Schedule of Intangible Assets
Gross Carrying Amount	720	720
Accumulated Amortization	600	600
Net Carrying Amount	120	120
Remaining Amortization Period	Varies
Customer Relations
Schedule of Intangible Assets
Gross Carrying Amount	240	240
Accumulated Amortization	80	76
Net Carrying Amount	$ 160	$ 164
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.