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Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 28, 2018	Dec. 29, 2017
Long-lived intangible assets:
Long-lived intangible assets, Gross Carrying Amount	$ 11,499	$ 11,521
Long-lived intangible assets, Accumulated Amortization	(11,255)	(11,250)
Long-lived intangible assets, Net	244	271
Patents and licenses [Member]
Long-lived intangible assets:
Long-lived intangible assets, Gross Carrying Amount	9,240	9,244
Long-lived intangible assets, Accumulated Amortization	(8,996)	(8,973)
Long-lived intangible assets, Net	244	271
Customer relationships [Member]
Long-lived intangible assets:
Long-lived intangible assets, Gross Carrying Amount	1,381	1,392
Long-lived intangible assets, Accumulated Amortization	(1,381)	(1,392)
Long-lived intangible assets, Net	0	0
Developed technology [Member]
Long-lived intangible assets:
Long-lived intangible assets, Gross Carrying Amount	878	885
Long-lived intangible assets, Accumulated Amortization	(878)	(885)
Long-lived intangible assets, Net	$ 0	$ 0

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Publisher FASB
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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

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