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Amortizable Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 27, 2013	Dec. 28, 2012
Amortized intangible assets:
Amortizable intangible assets, Gross Carrying Amount	$ 13,269	$ 13,787
Amortizable intangible assets, Accumulated Amortization	(11,702)	(11,645)
Amortizable intangible assets, Net	1,567	2,142
Patents and Licenses [Member]
Amortized intangible assets:
Amortizable intangible assets, Gross Carrying Amount	10,678	10,786
Amortizable intangible assets, Accumulated Amortization	(10,014)	(9,875)
Amortizable intangible assets, Net	664	911
Customer Relationships [Member]
Amortized intangible assets:
Amortizable intangible assets, Gross Carrying Amount	1,584	1,835
Amortizable intangible assets, Accumulated Amortization	(911)	(917)
Amortizable intangible assets, Net	673	918
Developed technology [Member]
Amortized intangible assets:
Amortizable intangible assets, Gross Carrying Amount	1,007	1,166
Amortizable intangible assets, Accumulated Amortization	(777)	(853)
Amortizable intangible assets, Net	$ 230	$ 313

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=26713463&loc=d3e16323-109275

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X

- 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=26713463&loc=d3e16323-109275

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X

- 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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph ((a)(1),(b))

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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