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Balance Sheet Components (Goodwill) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Aug. 02, 2017
Goodwill [Line Items]      
Goodwill $ 18,407 $ 18,407  
ViXS Systems, Inc.      
Goodwill [Line Items]      
Goodwill     $ 18,407