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Intangible Assets Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Dec. 30, 2017
Finite-Lived Intangible Assets [Line Items]      
Amortization of Intangible Assets $ 1,100 $ 1,100  
Total intangible assets 55,253   $ 51,798
Accumulated amortization (25,800)   (24,675)
Intangible assets, net 29,453   27,123
Patents      
Finite-Lived Intangible Assets [Line Items]      
Total intangible assets 21,558   20,623
Licenses-related party      
Finite-Lived Intangible Assets [Line Items]      
Total intangible assets 8,000   7,500
Customer relationships      
Finite-Lived Intangible Assets [Line Items]      
Total intangible assets 7,669   7,669
Acquired technology      
Finite-Lived Intangible Assets [Line Items]      
Total intangible assets 5,580   5,580
Trademarks      
Finite-Lived Intangible Assets [Line Items]      
Total intangible assets 4,112   4,036
Capitalized software development costs      
Finite-Lived Intangible Assets [Line Items]      
Total intangible assets 2,868   2,699
Other      
Finite-Lived Intangible Assets [Line Items]      
Total intangible assets $ 5,466   $ 3,691