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Related-Party Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2015
Sep. 28, 2014
Sep. 27, 2015
Sep. 28, 2014
Related Party Transaction [Line Items]        
Product sales to related parties $ 5 $ 307 $ 204 $ 2,898
Service sales to related parties 82 339 767 869
Total sales to related parties 87 646 971 3,767
Purchases from related parties 161 436 1,519 1,804
Applied Materials [Member]        
Related Party Transaction [Line Items]        
Product sales to related parties 0 230 161 2,572
Service sales to related parties 0 256 526 611
Oregon Health and Science University [Member]        
Related Party Transaction [Line Items]        
Product sales to related parties 1 77 20 326
Service sales to related parties 82 83 241 258
Purchases from related parties 0 41 11 119
Electro Scientific Industries [Member]        
Related Party Transaction [Line Items]        
Product sales to related parties 4 0 23 0
Purchases from related parties 19 0 19 0
TMC BV [Member]        
Related Party Transaction [Line Items]        
Purchases from related parties $ 142 $ 395 $ 1,489 $ 1,685