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Segment, Geographic, Product and Significant Customer Information - Revenue Net (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
segment
Dec. 26, 2015
USD ($)
Dec. 27, 2014
USD ($)
Revenues From External Customers And Long Lived Assets [Line Items]      
Number of operating segments | segment 1    
Net revenues:      
Total net revenues $ 221,129 $ 187,367 $ 166,443
South Korea [Member]      
Net revenues:      
Total net revenues 44,735 30,572 41,381
China [Member]      
Net revenues:      
Total net revenues 43,460 17,373 28,702
Singapore [Member]      
Net revenues:      
Total net revenues 37,096 17,395 7,905
United States [Member]      
Net revenues:      
Total net revenues 29,887 36,720 36,123
Taiwan [Member]      
Net revenues:      
Total net revenues 27,189 46,715 19,790
Japan [Member]      
Net revenues:      
Total net revenues 26,604 31,140 15,185
Other [Member]      
Net revenues:      
Total net revenues $ 12,158 $ 7,452 $ 17,357