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Balance Sheet Components (Property and Equipment, Other Information) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Balance Sheet Related Disclosures [Abstract]        
Depreciation and amortization $ 3.2 $ 2.6 $ 6.1 $ 5.5