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Financing Obligations - Revolving Line of Credit (Details)
3 Months Ended
Sep. 25, 2015
USD ($)
Jul. 02, 2017
USD ($)
Apr. 02, 2017
USD ($)
Jan. 01, 2017
USD ($)
Oct. 02, 2016
USD ($)
Jul. 03, 2016
USD ($)
Jan. 03, 2016
USD ($)
Line of Credit Facility [Line Items]              
Revolving debt outstanding         $ 5,000,000   $ 2,000,000
Revolving line of credit | Bank              
Line of Credit Facility [Line Items]              
Revolving line of credit $ 6,000,000            
Amount of increase in company in company election 12,000,000            
Revolving debt outstanding         $ 5,000,000    
Interest         3.63%    
Tangible net worth $ 12,000,000.0       $ 8,000,000.0 $ 10,000,000.0  
Percentage of proceeds from equity issuance 0.5            
Percentage of proceeds from investments 0.5            
Unrestricted cash or cash equivalents $ 6,000,000.0            
Ratio of quick assets to quick liabilities 2.00       1.50    
Revolving line of credit | Bank | Scenario, forecast              
Line of Credit Facility [Line Items]              
Tangible net worth   $ 8,000,000.0 $ 4,000,000.0 $ 6,000,000.0      
Ratio of quick assets to quick liabilities   1.25 1.25 1.50