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Balance Sheet Components - Schedule of Annual Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
Remaining 6 months of 2019 $ 586  
2020 1,145  
2021 852  
2022 544  
Net amount $ 3,127 $ 3,755