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Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 29, 2017	Dec. 30, 2016
Long-lived intangible assets:
Long-lived intangible assets, Gross Carrying Amount	$ 11,524	$ 11,421
Long-lived intangible assets, Accumulated Amortization	(11,198)	(10,948)
Long-lived intangible assets, Net	326	473
Patents and Licenses [Member]
Long-lived intangible assets:
Long-lived intangible assets, Gross Carrying Amount	9,245	9,224
Long-lived intangible assets, Accumulated Amortization	(8,965)	(8,930)
Long-lived intangible assets, Net	280	294
Customer relationships [Member]
Long-lived intangible assets:
Long-lived intangible assets, Gross Carrying Amount	1,393	1,343
Long-lived intangible assets, Accumulated Amortization	(1,359)	(1,209)
Long-lived intangible assets, Net	34	134
Developed technology [Member]
Long-lived intangible assets:
Long-lived intangible assets, Gross Carrying Amount	886	854
Long-lived intangible assets, Accumulated Amortization	(874)	(809)
Long-lived intangible assets, Net	$ 12	$ 45

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

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-Name Accounting Standards Codification
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-Paragraph 2
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