Intangible Assets (Details) - USD ($) $ in Thousands	Jul. 03, 2015	Jan. 02, 2015
Intangible assets:
Long-lived intangible assets, Gross Carrying Amount	$ 11,273	$ 11,334
Long-lived intangible assets, Accumulated Amortization	(10,523)	(10,464)
Long-lived intangible assets, Net	750	870
Patents and Licenses [Member]
Intangible assets:
Long-lived intangible assets, Gross Carrying Amount	9,193	9,205
Long-lived intangible assets, Accumulated Amortization	(8,869)	(8,859)
Long-lived intangible assets, Net	324	346
Customer relationships [Member]
Intangible assets:
Long-lived intangible assets, Gross Carrying Amount	1,272	1,302
Long-lived intangible assets, Accumulated Amortization	(954)	(911)
Long-lived intangible assets, Net	318	391
Developed technology [Member]
Intangible assets:
Long-lived intangible assets, Gross Carrying Amount	808	827
Long-lived intangible assets, Accumulated Amortization	(700)	(694)
Long-lived intangible assets, Net	$ 108	$ 133