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Segment and Geographic Information (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2016
USD ($)
Jul. 02, 2016
USD ($)
Jul. 04, 2015
USD ($)
Jul. 02, 2016
USD ($)
segment
Jul. 04, 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   $ 99,209 $ 106,460 $ 195,721 $ 195,057
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   $ 67,655 $ 83,395 $ 133,167 $ 145,929
Total revenue as percentage   68.00% 78.00% 68.00% 75.00%
Europe          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Total revenue   $ 14,729 $ 13,477 $ 30,738 $ 29,944
Total revenue as percentage   15.00% 13.00% 16.00% 15.00%
Americas          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Total revenue   $ 16,825 $ 9,588 $ 31,816 $ 19,184
Total revenue as percentage   17.00% 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