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Details Of Certain Accounts - Other Non-Current 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 | $ 762 | $ 1,869
Other | 719 | 2,009
Total other non-current liabilities | $ 1,481 | $ 3,878

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