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Balance Sheet Components - Components of Inventory and Printed Circuit Board Assemblies ("PCBAs") (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Inventory [Line Items] |  |
Total inventory and printed circuit board assemblies | $ 5,629 | $ 4,593
Inventory | 2,504 | 2,062
Other assets | 3,574 | 3,208
Printed Circuit Board Assemblies |  |
Inventory [Line Items] |  |
Other assets | 3,125 | 2,531
Raw Materials |  |
Inventory [Line Items] |  |
Total inventory and printed circuit board assemblies | 968 | 1,028
Finished Goods |  |
Inventory [Line Items] |  |
Total inventory and printed circuit board assemblies | $ 4,661 | $ 3,565

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