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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Inventory Disclosure [Abstract]    
Work in progress $ 44,387 $ 49,642
Finished goods 21,199 30,261
Total inventories 65,586 $ 79,903
Discontinued Operations | Millimeter Wave Business    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Inventory reserves $ 8,300