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Balance Sheet Components (Details) - The estimated future amortization expense by year
$ in Thousands
Dec. 31, 2017
USD ($)
The estimated future amortization expense by year [Abstract]  
2018 (nine months remaining) $ 2,428
2019 2,254
2020 1,757
2021 1,758
2022 1,757
Thereafter 12,073
Total $ 22,027