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Bonds Payable (Details) - Schedule of bonds payable - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Bonds payable |  |  |
Bonds payable, Total |  | $ 29,915 | $ 73,803
Long-term bonds payable |  |  |
Long-term bonds payable, Total | 73,147 | 73,147 | 29,259
Huzhou Saiyuan [Member] |  |  |
Bonds payable |  |  |
Bonds payable, Total |  |  | 43,888
Long-term bonds payable |  |  |
Long-term bonds payable, Total |  | 73,147 | 29,259
Third-party investors [Member] |  |  |
Bonds payable |  |  |
Bonds payable, Total |  | $ 29,915 | $ 29,915

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