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Leases - Leases Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
Dec. 28, 2019
Dec. 29, 2018
Lessee, Lease, Description [Line Items]    
Operating lease assets $ 968  
Operating lease right-of-use assets - extensible list us-gaap:OperatingLeaseRightOfUseAsset  
Accrued expenses and other current liabilities $ 511  
Accrued expenses and other current liabilities - extensible list us-gaap:AccruedLiabilitiesCurrent  
Operating lease liabilities $ 498  
Operating lease liabilities - extensible list us-gaap:OperatingLeaseLiabilityNoncurrent  
Total $ 1,009  
Total operating lease liabilities - extensible list us-gaap:AccruedLiabilitiesCurrent us-gaap:OperatingLeaseLiabilityNoncurrent  
Property and equipment, at cost $ 11,106 $ 13,981
Accumulated depreciation (10,820) (13,702)
Property and equipment, net 286 $ 279
Accrued expenses and other current liabilities $ 18  
Accrued expenses and other current liabilities - extensible list us-gaap:AccruedLiabilitiesCurrent  
Other liabilities $ 65  
Other liabilities - extensible list us-gaap:OtherLiabilitiesNoncurrent  
Finance Lease, Liability $ 83  
Total finance lease liabilities - extensible list us-gaap:AccruedLiabilitiesCurrent us-gaap:OtherLiabilitiesNoncurrent  
Finance leased assets    
Lessee, Lease, Description [Line Items]    
Property and equipment, at cost $ 96  
Accumulated depreciation (14)  
Property and equipment, net $ 82