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Balance Sheet Components - Future Scheduled Customer Payments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Capital Leases, Future Minimum Payments Receivable, Fiscal Year Maturity [Abstract]  
2019 $ 5,594
2020 6,022
2021 6,415
2022 6,853
2023 7,310
Thereafter $ 39,431