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Bonds Payable (Details) - Schedule of bonds payable - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Bonds payable |  |  |
Bonds payable, Total | $ 29,915 | $ 29,915 | $ 73,803
Long-term bonds payable |  |  |
Long-term bonds payable, Total | 137,490 | 73,147 |
Third-party investors [Member] |  |  |
Bonds payable |  |  |
Bonds payable, Total | 29,915 | 29,915 | 29,915
Long-term bonds payable |  |  |
Long-term bonds payable, Total | 64,343 |  |
Huzhou Saiyuan [Member] |  |  |
Bonds payable |  |  |
Bonds payable, Total |  |  | $ 43,888
Long-term bonds payable |  |  |
Long-term bonds payable, Total | $ 73,147 | $ 73,147 |

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- Definition Total of long term bonds payable. + References No definition available. + Details
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