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The Company and Basis of Presentation (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 25, 2015
Sep. 27, 2015
Sep. 27, 2015
Dec. 28, 2014
Sep. 28, 2014
Dec. 29, 2013
Liquidity [Line Items]            
Cash and cash equivalents   $ 23,441,000 $ 23,441,000 $ 30,050,000 $ 31,159,000 $ 37,406,000
Samsung            
Liquidity [Line Items]            
Percentage of total revenue generated from shipment   57.00% 44.00%      
Silicon Valley Bank | Revolving Line of Credit            
Liquidity [Line Items]            
Cash and cash equivalents in available credit   $ 5,000,000 $ 5,000,000      
Extended period of line of credit 2 years          
Loan advances $ 6,000,000          
Loan advances subject to increase $ 12,000,000.0