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Intangible Assets (Tables) | 3 Months Ended
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Mar. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] | Intangible assets, net consisted of the following (in thousands):
|  | March 30, 2018 |  | December 29, 2017 |
|  | Gross Carrying Amount |  | Accumulated Amortization |  | Net |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net |
Long-lived amortized intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patents and licenses |  | $ | 9,281 |  | $ | (9,003) |  | $ | 278 |  | $ | 9,244 |  | $ | (8,973) |  | $ | 271 |
Customer relationships |  |  | 1,476 |  |  | (1,476) |  |  | — |  |  | 1,392 |  |  | (1,392) |  |  | — |
Developed technology |  |  | 938 |  |  | (938) |  |  | — |  |  | 885 |  |  | (885) |  |  | — |
Total |  | $ | 11,695 |  | $ | (11,417) |  | $ | 278 |  | $ | 11,521 |  | $ | (11,250) |  | $ | 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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