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Related-Party Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 03, 2016
Jun. 28, 2015
Jul. 03, 2016
Jun. 28, 2015
Related Party Transaction [Line Items]        
Product sales to related parties $ 46 $ 11 $ 46 $ 38
Service sales to related parties 93 74 193 159
Total sales to related parties 139 85 239 197
Purchases from related parties 383 658 449 1,358
Oregon Health and Science University [Member]        
Related Party Transaction [Line Items]        
Product sales to related parties 46 7 46 19
Service sales to related parties 93 74 193 159
Purchases from related parties 0 11 6 11
Electro Scientific Industries [Member]        
Related Party Transaction [Line Items]        
Product sales to related parties 0 4 0 19
TMC BV [Member]        
Related Party Transaction [Line Items]        
Purchases from related parties $ 383 $ 647 $ 443 $ 1,347