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Deferred Tax, Net (Details) - Schedule of deferred tax assets - USD ($) | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of deferred tax assets [Abstract] |  |  |
Accrued expenses | $ 70,446 | $ 70,019 | $ 189,050
Write-off Erdos TCH net investment in sales-type leases | 6,352,124 | 6,155,300 | 6,349,604
US NOL | 415,851 | 254,035 | 3,246,655
PRC NOL | 2,623,801 | 10,849,690 | 10,424,558
Total deferred tax assets | 9,462,222 | 17,329,044 |
Less: valuation allowance for deferred tax assets | (9,462,222) | (17,329,044) | $ (24,854,272)
Deferred tax assets, net |  |  |

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