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Leases - Details of Right-of-Use Assets and Lease Liabilities (Details) - USD ($)
$ in Thousands
Jun. 28, 2020
Dec. 29, 2019
Right-of-use assets:    
Operating leases $ 1,470 $ 2,200
Finance leases 742 170
Total 2,212 2,370
Lease liabilities:    
Operating leases 1,506 1,816
Finance leases 712 471
Total $ 2,218 $ 2,287