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Segments and Geographical Information Schedule of Property Plant and Equipment by Geographic Area (Details) - Property, Plant and Equipment [Member] - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Location [Line Items]    
Long-Lived Assets $ 5,077 $ 2,976
UNITED STATES    
Location [Line Items]    
Long-Lived Assets 2,456 2,976
UNITED KINGDOM    
Location [Line Items]    
Long-Lived Assets 192 0
CHINA    
Location [Line Items]    
Long-Lived Assets 338 0
JAPAN    
Location [Line Items]    
Long-Lived Assets 206 0
KOREA, REPUBLIC OF    
Location [Line Items]    
Long-Lived Assets $ 1,885 $ 0