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Goodwill and other intangible assets (Details) - USD ($) $ in Thousands	Jan. 02, 2016	Dec. 27, 2014
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets cost	$ 27,000	$ 31,500
Intangible assets accumulated amortization	11,336	10,566
Finite-lived intangible assets, accumulated impairment loss		1,788
Total	15,664	19,146
Completed technology [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets cost	26,900	30,600
Intangible assets accumulated amortization	11,236	9,691
Finite-lived intangible assets, accumulated impairment loss		1,788
Total	15,664	19,121
Research contracts [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets cost	0	100
Intangible assets accumulated amortization	0	100
Finite-lived intangible assets, accumulated impairment loss		0
Total	0	0
Tradename [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets cost	100	800
Intangible assets accumulated amortization	100	775
Finite-lived intangible assets, accumulated impairment loss		0
Total	$ 0	$ 25

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- Definition

Finite-lived intangible assets, accumulated impairment loss

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
-Paragraph 2
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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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-Name Accounting Standards Codification
-Topic 350
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