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Inventory (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 29, 2018
Jun. 30, 2017
Dec. 29, 2017
Inventory [Line Items]      
Raw materials $ 2,134   $ 498
Work in process 3,737   3,997
Finished goods 3,265   2,854
Total 9,136   7,349
Write-downs on inventory 500 $ 500  
Inventory      
Inventory [Line Items]      
Total 8,371   6,657
Other long-term assets      
Inventory [Line Items]      
Total $ 765   $ 692