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Other Current Assets (Details) - Schedule of other current assets - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of other current assets [Abstract] |  |  |
Deferred transaction costs | $ 6,542 |  |
Prepaid rent | 1,105 | 3,511 |
Other | 770 | 280 |
Total | $ 8,417 | $ 3,791 | $ 914

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