Goodwill and Intangible Assets - Summary of Components of Gross and Net Intangible Asset (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 27, 2014	Dec. 28, 2013
Schedule of Intangible Assets
Gross Carrying Amount	$ 960	$ 960
Accumulated Amortization	672	632
Net Carrying Amount	288	328	[1]
Patents
Schedule of Intangible Assets
Gross Carrying Amount	720	720
Accumulated Amortization	600	572
Net Carrying Amount	120	148
Customer Relations
Schedule of Intangible Assets
Gross Carrying Amount	240	240
Accumulated Amortization	72	60
Net Carrying Amount	$ 168	$ 180
Amortization Life	10 years 6 months

[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 December 28, 2013.