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Inventory (Schedule of Inventory) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 28, 2018 | Dec. 29, 2017 | Dec. 30, 2016
Inventory [Line Items] |  |  |
Raw materials | $ 1,922 | $ 498 |
Work in process | 6,170 | 3,997 |
Finished goods | 3,836 | 2,854 |
Total | 11,928 | 7,349 |
Inventory write-down | 1,100 | 1,200 | $ 500
Inventory |  |  |
Inventory [Line Items] |  |  |
Total | 9,838 | 6,657 |
Inventory included in Other long-term assets |  |  |
Inventory [Line Items] |  |  |
Total | $ 2,090 | $ 692 |

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