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Prepaid Expenses and Other Current Assets (Details) - Schedule of receivables represented the amount available for future deduction against VAT payable - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of receivables represented the amount available for future deduction against VAT payable [Abstract] |  |  |
VAT receivables | $ 1,207 | $ 2,471 | $ 1,748
Advances to suppliers | 4,681 | 2,117 | 1,038
Other receivables | 6,330 | 688 | 627
Deposits | 746 | 746 | 535
Total | $ 12,964 | $ 6,022 | $ 3,948

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