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Intangible Assets, Net (Tables) | 12 Months Ended
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Dec. 29, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] | Intangible assets, net, consisted of the following (in thousands):
|  | December 29, 2017 |  | December 30, 2016 |
|  | Gross Carrying Amount |  | Accumulated Amortization |  | Net |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net |
Amortized intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patents and licenses |  | $ | 9,244 |  | $ | (8,973) |  | $ | 271 |  | $ | 9,224 |  | $ | (8,930) |  | $ | 294 |
Customer relationships |  |  | 1,392 |  |  | (1,392) |  |  | — |  |  | 1,343 |  |  | (1,209) |  |  | 134 |
Developed technology |  |  | 885 |  |  | (885) |  |  | — |  |  | 854 |  |  | (809) |  |  | 45 |
Total |  | $ | 11,521 |  | $ | (11,250) |  | $ | 271 |  | $ | 11,421 |  | $ | (10,948) |  | $ | 473 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | Future amortization of intangible assets is as follows (in thousands):
Fiscal Year |  | Amount |
2018 |  | $ | 33 |
2019 |  |  | 33 |
2020 |  |  | 33 |
2021 |  |  | 33 |
2022 |  |  | 33 |
Thereafter |  |  | 106 |
Total |  | $ | 271 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + 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) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + 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) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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