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Deferred Tax, Net (Details) - Schedule of deferred tax liability - USD ($) | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of deferred tax liability [Abstract] |  |  |
Accrued expenses | $ 70,721 | $ 70,019 | $ 189,050
Write-off Erdos TCH net investment in sales-type leases | 6,536,960 | 6,155,300 | 6,349,604
US NOL | 533,834 | 254,035 | 3,246,655
PRC NOL | 10,642,867 | 10,849,690 |
Total deferred tax assets | 17,784,382 | 17,329,044 | 24,854,272
Less: valuation allowance for deferred tax assets | (17,784,382) | (17,329,044) | (24,854,272)
Deferred tax assets, net |  |  |

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