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Schedule of Long-lived Assets by Geographic Areas (Details) - USD ($)
$ in Thousands
Dec. 26, 2020
Dec. 28, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Long-lived Assets $ 3,407 $ 4,227
UNITED STATES    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Long-lived Assets 3,028 3,647
UNITED KINGDOM    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Long-lived Assets 329 442
CHINA    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Long-lived Assets 11 37
JAPAN    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Long-lived Assets $ 39 $ 101