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Inventory (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 03, 2020
Dec. 28, 2018
Dec. 29, 2017
Inventory [Line Items]      
Raw materials $ 2,709 $ 1,922  
Work in process 9,447 6,170  
Finished goods 4,367 3,836  
Total 16,523 11,928  
Inventory write-down 1,300 1,100 $ 1,200
Current portion included in inventory      
Inventory [Line Items]      
Total 12,886 9,838  
Long-term portion included in other long-term assets      
Inventory [Line Items]      
Total $ 3,637 $ 2,090