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Segment and Geographic Information (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2016
USD ($)
Jul. 01, 2017
USD ($)
Jul. 02, 2016
USD ($)
Jul. 01, 2017
USD ($)
segment
Jul. 02, 2016
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]          
Number of operating segments | segment       1  
Proceeds from sale of business unit, net of cash sold       $ 300 $ 1,972
Gain on sale of business unit       300 2,646
Total revenue   $ 94,137 $ 99,209 $ 198,724 $ 195,721
Total revenue as percentage   100.00% 100.00% 100.00% 100.00%
Asia          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Total revenue   $ 64,946 $ 67,655 $ 138,404 $ 133,167
Total revenue as percentage   69.00% 68.00% 70.00% 68.00%
Europe          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Total revenue   $ 10,579 $ 14,729 $ 21,659 $ 30,738
Total revenue as percentage   11.00% 15.00% 11.00% 16.00%
Americas          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Total revenue   $ 18,612 $ 16,825 $ 38,661 $ 31,816
Total revenue as percentage   20.00% 17.00% 19.00% 16.00%
Qterics          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Proceeds from sale of business unit, net of cash sold $ 2,000 $ 300      
Gain on sale of business unit $ 2,600