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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