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Balance Sheet Components - Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2019 $ 2,668  
2020 2,668  
2021 668  
Net Carrying Amount $ 6,004 $ 8,672