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Inventories (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 29, 2018
Jun. 30, 2018
Dec. 30, 2017
Inventory Disclosure [Abstract]        
Work in progress $ 47,122 $ 47,122   $ 49,642
Finished goods 19,259 19,259   30,261
Total inventories 66,381 66,381   $ 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  
Inventory adjustments $ 300 $ 8,000