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Asset Subject to Buyback (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 22, 2019 | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2018
Asset Subject to Buyback (Details) [Line Items] |  |  |  |
Property and equipment, description |  | The Chengli project finished construction, and was transferred to the Company’s fixed assets at a cost of $35.24 million (without impairment loss) and ready to be put into operation as of December 31, 2018. |  |
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 8). However, because the loan was not deemed repaid due to the buyback provision (See Note 8 for detail), the Company kept the loan and the Chengli project recognized in its CFS as of March 31, 2021 and December 31, 2020. |  |  |
Chengali [Member] |  |  |  |
Asset Subject to Buyback (Details) [Line Items] |  |  |  |
Net property and equipment |  | $ 28,710 | $ 28,920 |
Fixed assets cost |  |  |  | $ 35,240

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