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The Company and Basis of Presentation (Details) (USD $)
3 Months Ended
Jun. 30, 2013
Dec. 30, 2012
Jul. 01, 2012
Jan. 01, 2012
Liquidity [Line Items]        
Cash and cash equivalents $ 17,761,000 $ 22,578,000 $ 26,867,000 $ 20,203,000
Percentage of revenue from major customer 46.00%      
Revolving Credit Facility [Member] | Silicon Valley Bank [Member]
       
Liquidity [Line Items]        
Line of credit facility, maximum borrowing capacity $ 6,000,000