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Inventory (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 28, 2018 | Sep. 29, 2017 | Dec. 29, 2017
Inventory [Line Items] |  |  |
Raw materials | $ 2,344 |  | $ 498
Work in process | 5,203 |  | 3,997
Finished goods | 4,082 |  | 2,854
Total | 11,629 |  | 7,349
Write-downs on inventory | 800 | $ 1,200 |
Inventory |  |  |
Inventory [Line Items] |  |  |
Total | 10,433 |  | 6,657
Other long-term assets |  |  |
Inventory [Line Items] |  |  |
Total | $ 1,196 |  | $ 692

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