Amortizable Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Oct. 03, 2014	Jan. 03, 2014
Amortized intangible assets:
Amortizable intangible assets, Gross Carrying Amount	$ 12,977	$ 13,074
Amortizable intangible assets, Accumulated Amortization	(11,944)	(11,694)
Amortizable intangible assets, Net	1,033	1,380
Patents and Licenses [Member]
Amortized intangible assets:
Amortizable intangible assets, Gross Carrying Amount	10,617	10,637
Amortizable intangible assets, Accumulated Amortization	(10,213)	(10,057)
Amortizable intangible assets, Net	404	580
Customer relationships [Member]
Amortized intangible assets:
Amortizable intangible assets, Gross Carrying Amount	1,443	1,490
Amortizable intangible assets, Accumulated Amortization	(974)	(894)
Amortizable intangible assets, Net	469	596
Developed technology [Member]
Amortized intangible assets:
Amortizable intangible assets, Gross Carrying Amount	917	947
Amortizable intangible assets, Accumulated Amortization	(757)	(743)
Amortizable intangible assets, Net	$ 160	$ 204