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Balance Sheet Components - Schedule of Annual Estimated Amortization Expense for Intangibles (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
Remaining 6 months of 2018 $ 617  
2019 1,126  
2020 1,022  
2021 783  
2022 545  
Net amount $ 4,093 $ 4,717