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Notes Payable - Additional Information (Detail)
 12 Months Ended
Mar. 23, 2017
USD ($)
Dec. 29, 2015
USD ($)
CreditFacility
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]        
Borrowings outstanding     $ 5,700,000 $ 5,543,000
Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of credit facility, agreement date     Dec. 29, 2015  
Number of revolving credit facilities | CreditFacility   2    
Additional borrowing capacity     $ 0  
Credit facility's interest rate, Description     Interest rate on both facilities is the three month LIBOR (0.98% at December 31, 2016) plus 4.00% per year.  
Leverage test of total liabilities to total net worth   1.25    
Borrowings outstanding     $ 5,700,000 $ 5,540,000
Revolving Credit Facility | Minimum        
Debt Instrument [Line Items]        
Fixed charge coverage ratio   125.00%    
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Debt instrument variable interest rate     0.98%  
Credit facility's interest rate   4.00%    
Facility A        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 4,000,000    
Line of credit term   2 years    
Revolving credit agreement maturity date   Dec. 29, 2017    
Amount borrowed under revolving credit facility   $ 1,040,000 $ 1,500,000  
Letter of credit outstanding amount     1,250,000  
Facility B        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 4,500,000    
Revolving credit agreement maturity date   Dec. 29, 2020    
Amount borrowed under revolving credit facility   $ 4,500,000 $ 4,200,000  
Line of credit facility, borrowing capacity, description     The amount available to borrow under Facility B declines from the initial $4.50 million by $0.15 million each six months.  
Revolving line of credit decline term     6 months  
Decline in revolving line of credit   $ 150,000    
Senior Secured Term Note | Subsequent Event        
Debt Instrument [Line Items]        
Debt principal amount $ 7,000,000      
Proceeds from debt used as working capital 1,000,000      
Debt principal periodic payment amount $ 500,000      
Debt instrument, interest payment frequency Monthly interest only payments      
Debt instrument, payment terms The Note is payable in monthly interest only payments, in arrears, with $0.50 million of principal repayable no later than June 30, 2017 and the balance due March 23, 2021.      
Fixed interest rate 11.50%