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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 26, 2015
Dec. 27, 2014
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 13,964 $ 12,714  
Less: accumulated deprecation (8,965) (8,121)  
Property and equipment, net 4,999 4,593  
Depreciation 1,600 1,300 $ 1,500
Equipment, furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 7,682 7,245  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 6,081 5,457  
Construction in progress      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 201 $ 12