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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Dec. 27, 2014
Property and Equipment      
Property, Plant and Equipment, Gross $ 70,779 $ 69,580  
Less: accumulated depreciation 43,247 42,730  
Property, Plant and Equipment, Net, Total 27,532 26,850  
Depreciation And Amortization [Abstract]      
Depreciation 10,000 11,400 $ 9,200
Computer and equipment [Member]      
Property and Equipment      
Property, Plant and Equipment, Gross 7,378 13,825  
Furniture [Member]      
Property and Equipment      
Property, Plant and Equipment, Gross 2,906 2,441  
Machinery [Member]      
Property and Equipment      
Property, Plant and Equipment, Gross 9,154 7,134  
Tooling [Member]      
Property and Equipment      
Property, Plant and Equipment, Gross 20,487 16,599  
Leasehold improvements [Member]      
Property and Equipment      
Property, Plant and Equipment, Gross 21,383 21,022  
Software and Software Development Costs [Member]      
Property and Equipment      
Property, Plant and Equipment, Gross $ 9,471 $ 8,559