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Balance Sheet Components - Intangible Assets, Net- Amortization expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Acquired intangible amortization expense    
2019 $ 5  
2020 5  
2021 5  
2022 5  
Thereafter 18  
Intangible assets, net $ 38 $ 43