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Goodwill, Other Intangible Assets and Other Assets - Other Intangible Assets (Detail) (USD $)
 3 Months Ended
Mar. 29, 2014
Mar. 30, 2013
Dec. 28, 2013
Finite-Lived Intangible Assets [Line Items]      
Document Period End Date Mar. 29, 2014    
Finite-Lived Intangible Assets, Gross $ 31,500,000   $ 31,500,000
Intangible assets accumulated amortization 7,948,000   7,044,000
Finite-lived intangible assets, accumulated impairment loss 1,788,000   1,788,000
Intangible Assets, Net 21,764,000   22,668,000
Amortization of Acquired Intangible Assets 900,000 1,000,000  
Completed technology
      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 30,600,000   30,600,000
Intangible assets accumulated amortization 7,098,000   6,202,000
Finite-lived intangible assets, accumulated impairment loss 1,788,000   1,788,000
Intangible Assets, Net 21,714,000   22,610,000
Research contracts
      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 100,000   100,000
Intangible assets accumulated amortization 100,000   100,000
Finite-lived intangible assets, accumulated impairment loss 0   0
Intangible Assets, Net 0   0
Trade Names
      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 800,000   800,000
Intangible assets accumulated amortization 750,000   742,000
Finite-lived intangible assets, accumulated impairment loss 0   0
Intangible Assets, Net $ 50,000   $ 58,000