Annual report pursuant to Section 13 and 15(d)

Property and Equipment, Net - Summary of Property and Equipment (Details)

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Property and Equipment, Net - Summary of Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 48,041 $ 52,266
Less accumulated depreciation and amortization (32,956) (35,788)
Property and equipment, net 15,085 16,478
Land    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 630 630
Building    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 8,877 8,877
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 12,281 12,368
Computer software (purchased and developed)    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 22,389 26,717
Vehicles    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 85 98
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 1,033 1,007
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 664 1,030
Construction in process    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 2,082 $ 1,539