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Property and Equipment - Long-lived assets (Details) - USD ($)
$ in Thousands
Dec. 28, 2019
Dec. 29, 2018
Long-lived assets by geographic location    
Long-lived assets (property and equipment, net) $ 61,295 $ 48,088
United States    
Long-lived assets by geographic location    
Long-lived assets (property and equipment, net) 51,974 39,654
United Kingdom    
Long-lived assets by geographic location    
Long-lived assets (property and equipment, net) 7,803 6,890
Other    
Long-lived assets by geographic location    
Long-lived assets (property and equipment, net) 1,518 1,544
Total foreign    
Long-lived assets by geographic location    
Long-lived assets (property and equipment, net) $ 9,321 $ 8,434