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Related-Party Activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 03, 2016
Mar. 29, 2015
Related Party Transaction [Line Items]    
Product sales to related parties $ 0 $ 27
Service sales to related parties 100 85
Total sales to related parties 100 112
Purchases from related parties 66 700
Oregon Health and Science University [Member]    
Related Party Transaction [Line Items]    
Product sales to related parties 0 12
Service sales to related parties 100 85
Purchases from related parties 6 0
Electro Scientific Industries [Member]    
Related Party Transaction [Line Items]    
Product sales to related parties 0 15
TMC BV [Member]    
Related Party Transaction [Line Items]    
Purchases from related parties $ 60 $ 700