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Certain Balance Sheet Components - Other Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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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

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