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Obligations - Revolving Line of Credit (Details)
9 Months Ended
Sep. 27, 2015
USD ($)
Sep. 25, 2015
USD ($)
Dec. 28, 2014
USD ($)
Line of Credit Facility [Line Items]      
Revolving debt outstanding $ 1,000,000   $ 1,000,000
Bank | Revolving Line of Credit      
Line of Credit Facility [Line Items]      
Revolving line of credit   $ 6,000,000  
Revolving debt outstanding $ 1,000,000    
Interest rate 3.13%    
Tangible net worth $ 12,000,000    
Percentage of proceeds from any equity issuance 0.5    
Percentage of proceeds from any investment 0.5    
Unrestricted cash or cash equivalent $ 6,000,000    
Long-term portion of the obligations 1.10