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Disaggregation of Revenues, Geographic Sales and Product Sales - Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Details) - Property, Plant and Equipment - USD ($)
$ in Thousands
Dec. 28, 2018
Dec. 29, 2017
Geographic and Product Data [Line Items]    
Property, plant and equipment, net $ 11,694 $ 10,047
US    
Geographic and Product Data [Line Items]    
Property, plant and equipment, net 10,416 8,523
SWITZERLAND    
Geographic and Product Data [Line Items]    
Property, plant and equipment, net 705 912
JAPAN    
Geographic and Product Data [Line Items]    
Property, plant and equipment, net $ 573 $ 612