Asset Subject to Buyback (Details) [Line Items]

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.

Asset Subject to Buyback (Details) [Line Items]

Fixed assets cost

$ 35,240

Asset Subject to Buyback (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
Asset Subject to Buyback (Details) - USD ($) $ in Thousands	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