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Inventory (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 29, 2019 | Mar. 30, 2018 | Dec. 28, 2018
Inventory [Line Items] |  |  |
Raw materials | $ 2,245,000 |  | $ 1,922,000
Work in process | 6,514,000 |  | 6,170,000
Finished goods | 4,862,000 |  | 3,836,000
Total | 13,621,000 |  | 11,928,000
Write-downs on inventory | 200,000 | $ 0 |
Current portion included in Inventory |  |  |
Inventory [Line Items] |  |  |
Total | 10,143,000 |  | 9,838,000
Long-term portion included in Other long-term assets |  |  |
Inventory [Line Items] |  |  |
Total | $ 3,478,000 |  | $ 2,090,000

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