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Inventory (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Dec. 28, 2018
Inventory [Line Items]      
Raw materials $ 1,906   $ 1,922
Work in process 11,035   6,170
Finished goods 7,311   3,836
Total 20,252   11,928
Write-downs on inventory 400 $ 800  
Current portion included in Inventory      
Inventory [Line Items]      
Total 13,366   9,838
Long-term portion included in Other long-term assets      
Inventory [Line Items]      
Total $ 6,886   $ 2,090