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Intangible Assets (Tables) | 3 Months Ended
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Mar. 29, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets | Intangible assets, net consisted of the following (in thousands):
|  | March 29, 2019 |  |  | December 28, 2018 |
Long-lived amortized intangible assets |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net |
Patents and licenses |  | $ | 9,284 |  |  | $ | (9,021 | ) |  | $ | 263 |  |  | $ | 9,257 |  |  | $ | (9,014 | ) |  | $ | 243 |

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