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The Company and Basis of Presentation (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 28, 2015
Jun. 28, 2015
Dec. 28, 2014
Jun. 29, 2014
Dec. 29, 2013
Liquidity [Line Items]          
Cash and cash equivalents $ 26,415,000 $ 26,415,000 $ 30,050,000 $ 34,330,000 $ 37,406,000
Revolving credit facility | Silicon valley bank          
Liquidity [Line Items]          
Line of credit facility, additional borrowing capacity 5,000,000 5,000,000      
Maximum borrowing capacity $ 6,000,000 $ 6,000,000      
Samsung          
Liquidity [Line Items]          
Percentage of revenue from major customer 41.00% 40.00%      
Maximum | Revolving credit facility | Silicon valley bank          
Liquidity [Line Items]          
Additional borrowing capacity $ 10,000,000.0 $ 10,000,000.0