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Asset Subject to Buyback and Construction in Progress (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 22, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Asset Subject to Buyback and Construction in Progress (Details) [Line Items] |  |  |  |
Transferred of shares, 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 9). However, because the loan was not deemed repaid due to the buyback right (See Note 9 for detail), the Company kept the loan and the Chengli project in its books as fixed assets for accounting purposes. |  |  |
Property and equipment, description |  | On January 10, 2020, Zhonghong, Tianyu and Huaxin signed a transfer agreement to transfer all assets under construction and related rights and interests of Xuzhou Tian’an Project to Tianyu for RMB 170 million including $0.6 million VAT (total of $24.37 million) in three installment payments. The Company recorded impairment loss of $13.9 million as of December 31, 2019. The 1st installment payment of RMB 50 million ($7.17 million) was to be paid within 20 working days after the contract was signed. The 2nd installment payment of RMB 50 million ($7.17 million) was to be paid within 20 working days after completion of the project construction but no later than July 31, 2020. The final installment payment of RMB 70 million ($10.03 million) was to be paid before December 31, 2020. |  |
Chengali [Member] |  |  |  |
Asset Subject to Buyback and Construction in Progress (Details) [Line Items] |  |  |  |
Net property and equipment |  | $ 28,920 | $ 27,040 |
Fixed assets cost |  |  |  | $ 35,240

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