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Goodwill, Other Intangible Assets and Other Assets - Other Intangible Assets (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Sep. 27, 2014
Sep. 28, 2013
Dec. 28, 2013
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross $ 31,500,000   $ 31,500,000   $ 31,500,000
Intangible assets accumulated amortization 9,693,000   9,693,000   7,044,000
Finite-lived intangible assets, accumulated impairment loss 1,788,000   1,788,000   1,788,000
Intangible Assets, Net 20,019,000   20,019,000   22,668,000
Amortization of Acquired Intangible Assets 900,000 900,000 2,700,000 2,800,000  
Completed technology
          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 30,600,000   30,600,000   30,600,000
Intangible assets accumulated amortization 8,826,000   8,826,000   6,202,000
Finite-lived intangible assets, accumulated impairment loss 1,788,000   1,788,000   1,788,000
Intangible Assets, Net 19,986,000   19,986,000   22,610,000
Research contracts
          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 100,000   100,000   100,000
Intangible assets accumulated amortization 100,000   100,000   100,000
Finite-lived intangible assets, accumulated impairment loss 0   0   0
Intangible Assets, Net 0   0   0
Trade Names
          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 800,000   800,000   800,000
Intangible assets accumulated amortization 767,000   767,000   742,000
Finite-lived intangible assets, accumulated impairment loss 0   0   0
Intangible Assets, Net $ 33,000   $ 33,000   $ 58,000