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Balance Sheet Components (Intangibles, Other Information) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Sep. 29, 2019
Sep. 30, 2018
Balance Sheet Related Disclosures [Abstract]        
Acquired intangible assets, estimated useful life 10 months 24 days      
Amortization of intangibles $ 0.4 $ 0.4 $ 1.2 $ 1.2