Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Financial Assets Valued on Recurring Basis for Cash and Cash Equivalents and Investments (Detail)

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Fair Value Measurements - Financial Assets Valued on Recurring Basis for Cash and Cash Equivalents and Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 27, 2014
Dec. 28, 2013
Sep. 28, 2013
Dec. 29, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 1,255 $ 818 $ 1,099 $ 1,030
Short-term investments 39 47    
Fair Value, Measurements, Recurring
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, Fair Value Disclosure 1,294 865    
Fair Value, Measurements, Recurring | Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, Fair Value Disclosure 1,294 865    
Fair Value, Measurements, Recurring | Level 2
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, Fair Value Disclosure          
Fair Value, Measurements, Recurring | Level 3
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, Fair Value Disclosure          
Fair Value, Measurements, Recurring | Valuation Techniques | Cash and cash equivalents
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 1,255 [1] 818 [1]    
Fair Value, Measurements, Recurring | Valuation Techniques | Investments
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Short-term investments 39 [2] 47 [2]    
Fair Value, Measurements, Recurring | Valuation Techniques | Level 1 | Cash and cash equivalents
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 1,255 [1]      
Fair Value, Measurements, Recurring | Valuation Techniques | Level 1 | Investments
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents   818 [1]    
Short-term investments 39 [2] 47 [2]    
Fair Value, Measurements, Recurring | Valuation Techniques | Level 2 | Cash and cash equivalents
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents    [1]    [1]    
Fair Value, Measurements, Recurring | Valuation Techniques | Level 2 | Investments
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Short-term investments    [2]    [2]    
Fair Value, Measurements, Recurring | Valuation Techniques | Level 3 | Cash and cash equivalents
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents    [1]    [1]    
Fair Value, Measurements, Recurring | Valuation Techniques | Level 3 | Investments
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Short-term investments    [2]    [2]    
[1] Cash equivalents consist primarily of money market funds and short-term investments with original maturity dates of three months or less at the date of purchase, for which the Company determines fair value through quoted market prices.
[2] Investments consist of mutual funds, classified as short-term investments available-for-sale and recorded at fair market value, based on quoted prices of identical assets that are trading in active markets as of the end of the period for which the values are determined. These mutual funds invest in government bonds, stocks and short-term money market funds,