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Certain Balance Sheet Components - Other Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Deferred revenue, net of current portion $ 6,882 $ 8,865
Other long-term liabilities 1,196 1,587
Other Liabilities, Noncurrent, Total $ 8,078 $ 10,452