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Segment and Geographic Information (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2016
USD ($)
Oct. 01, 2016
USD ($)
Oct. 03, 2015
USD ($)
Oct. 01, 2016
USD ($)
segment
Oct. 03, 2015
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]          
Number of operating segments | segment       1  
Gain on sale of business unit       $ 2,646 $ 0
Proceeds from sale of business unit, net of cash sold       1,972 0
Total revenue   $ 113,225 $ 109,715 $ 308,946 $ 304,772
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   $ 83,797 $ 86,443 $ 216,964 $ 232,372
Total revenue as percentage   74.00% 79.00% 70.00% 76.00%
Europe          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Total revenue   $ 13,111 $ 13,061 $ 43,849 $ 43,005
Total revenue as percentage   12.00% 12.00% 14.00% 14.00%
Americas          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Total revenue   $ 16,317 $ 10,211 $ 48,133 $ 29,395
Total revenue as percentage   14.00% 9.00% 16.00% 10.00%
Qterics          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Gain on sale of business unit $ 2,600        
Proceeds from sale of business unit, net of cash sold $ 2,000