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Inventory (Details) - USD ($) $ in Thousands | Apr. 03, 2020 | Jan. 03, 2020
--- | --- | ---
Inventory [Line Items] |  |
Raw materials | $ 2,215 | $ 2,709
Work in process | 14,278 | 9,447
Finished goods | 4,865 | 4,367
Total | 21,358 | 16,523
Current portion included in inventory |  |
Inventory [Line Items] |  |
Total | 15,417 | 12,886
Long-term portion included in other long-term assets |  |
Inventory [Line Items] |  |
Total | $ 5,941 | $ 3,637

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