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Balance Sheet Components - Intangible Assets, Net- Amortization expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Acquired intangible amortization expense    
2020 $ 5  
2021 5  
2022 5  
2023 5  
2024 and thereafter 12  
Intangible assets, net $ 32 $ 38