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Schedule of Prepayments and Other Current Assets (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Prepayments And Other Current Assets |  |  |
Prepaid expenses |  | $ 3,400,080 | $ 3,370,757
Prepaid software license |  | 378,488 | 89,822
Refundable income and franchise taxes |  | 733,553 | 733,553
Security deposits |  | 92,494 | 96,135
Other receivables |  | 62,648 | 20,468
Prepayments and other current assets | $ 4,875,177 | $ 4,667,263 | $ 4,310,735

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