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Inventory (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Dec. 29, 2017
Inventory [Line Items]      
Raw materials $ 2,344   $ 498
Work in process 5,203   3,997
Finished goods 4,082   2,854
Total 11,629   7,349
Write-downs on inventory 800 $ 1,200  
Inventory      
Inventory [Line Items]      
Total 10,433   6,657
Other long-term assets      
Inventory [Line Items]      
Total $ 1,196   $ 692