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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 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 + Details
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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=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after 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 + Details
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