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Asset Subject to Buyback (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jan. 22, 2019 | Mar. 31, 2022 | Dec. 31, 2018
Asset Subject to Buyback (Details) [Line Items] |  |  |
Transfer amount description | On January 22, 2019, Xi’an Zhonghong completed the transfer of Chengli CDQ WHPG project as the partial repayment for the loan and accrued interest of RMB 188,639,400 ($27.54 million) to HYREF (see Note 8). |  |
Gain on partial repayment of entrusted loan |  | $ 3,100 |
Chengli Project [Member] |  |  |
Asset Subject to Buyback (Details) [Line Items] |  |  |
Fixed assets cost |  |  | $ 35,240

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