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Inventory (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Apr. 02, 2021 | Apr. 03, 2020 | Jan. 01, 2021
Inventory [Line Items] |  |  |
Raw materials | $ 7,988 |  | $ 7,773
Work in process | 21,873 |  | 20,610
Finished goods | 5,786 |  | 7,291
Total | 35,647 |  | 35,674
Inventory write-down | 2,100 | $ 200 |
Current portion included in inventory |  |  |
Inventory [Line Items] |  |  |
Total | 24,757 |  | 20,973
Long-term portion included in other long-term assets |  |  |
Inventory [Line Items] |  |  |
Total | $ 10,890 |  | $ 14,701

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