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Inventory (Schedule of Inventory) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2017
Dec. 30, 2016
Jan. 01, 2016
Inventory [Line Items]      
Raw materials $ 498 $ 863  
Work in process 3,997 2,343  
Finished goods 2,854 738  
Total 7,349 3,944  
Inventory write-down 1,200 500 $ 1,200
Inventory [Member]      
Inventory [Line Items]      
Total 6,657 3,338  
Other long-term assets [Member]      
Inventory [Line Items]      
Total $ 692 $ 606