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Balance Sheet Components - Components of Inventory and Printed Circuit Board Assemblies ("PCBAs") (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Inventory [Line Items]    
Total inventory and printed circuit board assemblies $ 5,313 $ 4,037
Raw materials    
Inventory [Line Items]    
Total inventory and printed circuit board assemblies 2,469 1,574
Finished goods    
Inventory [Line Items]    
Total inventory and printed circuit board assemblies $ 2,844 $ 2,463