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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 02, 2016
Dec. 27, 2014
Dec. 28, 2013
Property and Equipment      
Property, Plant and Equipment, Gross $ 69,580 $ 70,438  
Less: accumulated depreciation 42,730 39,141  
Property, Plant and Equipment, Net, Total 26,850 31,297  
Depreciation And Amortization [Abstract]      
Depreciation 11,400 9,200 $ 8,100
Computer and equipment [Member]      
Property and Equipment      
Property, Plant and Equipment, Gross 13,825 15,173  
Furniture [Member]      
Property and Equipment      
Property, Plant and Equipment, Gross 2,441 2,297  
Machinery [Member]      
Property and Equipment      
Property, Plant and Equipment, Gross 7,134 5,307  
Tooling [Member]      
Property and Equipment      
Property, Plant and Equipment, Gross 16,599 18,614  
Leasehold improvements [Member]      
Property and Equipment      
Property, Plant and Equipment, Gross 21,022 20,833  
Software and Software Development Costs [Member]      
Property and Equipment      
Property, Plant and Equipment, Gross $ 8,559 $ 8,214