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Acquisitions - Micrium (Details) - USD ($) $ in Thousands | Oct. 03, 2016 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
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Purchase price allocation |  |  |  |
Goodwill |  | $ 397,344 | $ 288,227 | $ 276,130
Micrium |  |  |  |
Acquisitions |  |  |  |
Purchase price of acquisition | $ 12,400 |  |  |
Cash consideration | 8,200 |  |  |
Stock consideration | 4,200 |  |  |
Additional stock consideration based on economic substance | $ 1,000 |  |  |
Post-combination compensation expense recognition period (in years) | 4 years |  |  |
Purchase price allocation |  |  |  |
Intangible assets | $ 9,500 |  |  |
Goodwill | 3,400 |  |  |
Other net liabilities | $ 500 |  |  |

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