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Loan Payable (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 19, 2019 USD ($) | Dec. 19, 2019 CNY (¥) | Dec. 20, 2019 USD ($) | Dec. 20, 2019 CNY (¥) | Mar. 31, 2021 USD ($) | Mar. 31, 2021 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 20, 2019 CNY (¥) | Dec. 19, 2019 CNY (¥) | Jan. 04, 2019 USD ($) | Jan. 04, 2019 CNY (¥) | Dec. 29, 2018 USD ($) | Dec. 29, 2018 CNY (¥) | Jul. 30, 2018 USD ($) | Jul. 30, 2018 CNY (¥) | Aug. 06, 2017 USD ($) | Aug. 06, 2017 CNY (¥) | Aug. 06, 2016 USD ($) | Aug. 06, 2016 CNY (¥)
Loan Payable (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt maturities repayments of principal in fourth year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,270 | ¥ 100,000,000 |  |
Description of remaining loan balance |  |  |  |  | The Company had paid RMB 50 million ($7.54 million) of the RMB 280 million ($42.22 million), and on August 5, 2016, the Company entered into a supplemental agreement with the lender to extend the due date of the remaining RMB 230 million ($34.68 million) of the original RMB 280 million ($45.54 million) to August 6, 2017. During the year ended December 31, 2017, the Company negotiated with the lender again to further extend the remaining loan balance of RMB 230 million ($34.68 million), RMB 100 million ($16.27 million), and RMB 77 million ($12.52 million) (which included investment from Xi’an TCH of RMB 75 million and was netted off with the entrusted loan payable of the HYREF Fund in the balance sheet). The lender had tentatively agreed to extend the remaining loan balance until August 2019 with an adjusted annual interest rate of 9%, subject to the final approval from its headquarters. The headquarters did not approve the extension proposal with an adjusted annual interest rate of 9%; however, on December 29, 2018, the Company worked out with the lender an alternative repayment proposal as described below. As of December 31, 2018, the entrusted loan payable had an outstanding balance of $59.29 million, of which, $10.92 million was from the investment of Xi’an TCH; accordingly, the Company netted the loan payable of $10.92 million with the long-term investment to the HYREF Fund made by Xi’an TCH. As of March 31, 2021, the interest payable for this loan was $10.07 million and the outstanding balance for this loan was $22.05 million including a non-current portion of $0.30 million. As of December 31, 2020, the interest payable for this loan was $10.14 million and the outstanding balance for this loan was $22.20 million including a non-current portion of $0.30 million. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payable for loan |  |  |  |  |  |  | $ 10,140 |  |  |  |  |  |  |  |  |  |  |  |
Outstanding loan balance |  |  |  |  |  |  | 22,200 |  |  |  |  |  |  |  |  |  |  |  |
Loan payable |  |  |  |  |  |  | $ 300 |  |  |  |  |  |  |  |  |  |  |  |
Total buy back price |  |  | $ 37,520 |  |  |  |  | ¥ 261,727,506 |  |  |  |  |  |  |  |  |  |  |
Accrued Interest |  |  | $ 2,100 | ¥ 14,661,506 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan asset value |  |  |  |  | $ 27,770 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan and related interest |  |  |  |  | $ 32,120 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer price installment payments, description |  |  | Mr. Bai, Xi’an TCH and Xi’an Zhonghong agreed to have Mr. Bai repay the Company in cash for the transfer price of Xuzhou Huayu and Shenqiu in five installment payments. The 1st payment of RMB 50 million ($7.17 million) is due on January 5, 2020, the 2nd payment of RMB 50 million ($7.17 million) was due on February 5, 2020, the 3rd payment of RMB 50 million ($7.17 million) was due on April 5, 2020, the 4th payment of RMB 50 million ($7.17 million) is due on June 30, 2020, and the final payment of RMB 47,066,000 ($6.75 million) is due on September 30, 2020. As of March 31, 2020, the Company has received the full payment of RMB 247 million ($36.28 million) from Mr. Bai. | Mr. Bai, Xi’an TCH and Xi’an Zhonghong agreed to have Mr. Bai repay the Company in cash for the transfer price of Xuzhou Huayu and Shenqiu in five installment payments. The 1st payment of RMB 50 million ($7.17 million) is due on January 5, 2020, the 2nd payment of RMB 50 million ($7.17 million) was due on February 5, 2020, the 3rd payment of RMB 50 million ($7.17 million) was due on April 5, 2020, the 4th payment of RMB 50 million ($7.17 million) is due on June 30, 2020, and the final payment of RMB 47,066,000 ($6.75 million) is due on September 30, 2020. As of March 31, 2020, the Company has received the full payment of RMB 247 million ($36.28 million) from Mr. Bai. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lender repayment, description |  |  |  |  | The lender agreed to extend the repayment of RMB 77.00 million ($11.04 million) to July 8, 2023; of which, RMB 75.00 million ($10.81 million) was Xi’an TCH’s investment into the HYREF fund as a secondary limited partner, and the Company netted off the investment of RMB 75 million ($10.81 million) by Xi’an TCH with the entrusted loan payable of the HYREF Fund. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Zhonghong [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan Payable (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.50% | 12.50% |  |  |  |
Long term debt maturities repayments of principal in third year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 42,220 | ¥ 280,000,000
Debt amount paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,540 | ¥ 50,000,000
Long term debt maturities repayments of principal in fifth year |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,520 | ¥ 77,000,000 |  |  |  |
Xuzhou Huayu project [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan Payable (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan payable |  |  |  |  |  |  |  |  |  | $ 17,520 | ¥ 120,000,000 |  |  |  |  |  |  |  |
Xuzhou Huayu project [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan Payable (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt amount paid |  |  |  |  |  |  |  |  |  | 18,550 | 127,066,000 |  |  |  |  |  |  |  |
Loan payable |  |  |  |  |  |  |  |  |  | $ 36,070 | ¥ 247,066,000 |  |  |  |  |  |  |  |
Mr. Chonggong Bai [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan Payable (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of remaining loan balance |  |  |  |  | Xi’an Hanneng is a holding company and was supposed to own 47,150,000 shares of Xi’an Huaxin New Energy Co., Ltd. (“Huaxin”), so that HYREF will indirectly receive and own such shares of Xi’an Huaxin as the repayment for the loan of Zhonghong. Xi’an Hanneng already owned 29,948,000 shares of Huaxin; however, Xi’an Hanneng was not able to obtain the remaining 17,202,000 shares due to halted trading of Huaxin stock by NEEQ for not filing its 2018 annual report. |  |  |  |  |  |  |  |  |  |  |  |  |  |
HYREF loan (entrusted loan) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan Payable (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fund capital contribution |  |  |  |  | $ 77,000 | ¥ 460,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Description of equity investment |  |  |  |  | The HYREF Fund invested RMB 3 million ($0.5 million) as an equity investment and RMB 457 million ($74.5 million) as a debt investment in Xi’an Zhonghong; in return for such investments, the HYREF Fund was to receive interest from Zhonghong for the HYREF Fund’s debt investment. The loan was collateralized by the accounts receivable and the fixed assets of Shenqiu Phase I and II power generation systems; the accounts receivable and fixed assets of Zhonghong’s three CDQ WHPG systems; and a 27 million RMB ($4.39 million) capital contribution made by Xi’an TCH in Zhonghong. Repayment of the loan (principal and interest) was also jointly and severally guaranteed by Xi’an TCH and the Chairman and CEO of the Company. In the fourth quarter of 2015, three power stations of Erdos TCH were pledged to Industrial Bank as an additional guarantee for the loan to Zhonghong’s three CDQ WHPG systems. In 2016, two additional power stations of Erdos TCH and Pucheng Phase I and II systems were pledged to Industrial Bank as an additional guarantee along with Xi’an TCH’s equity in Zhonghong. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Xi’an TCH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan Payable (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total buy back price | $ 37,520 |  |  |  |  |  |  |  | ¥ 261,727,506 |  |  |  |  |  |  |  |  |  |
Accrued Interest | $ 2,100 | ¥ 14,661,506 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer Agreement [Member] | HYREF [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan Payable (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan payable |  |  |  |  |  |  |  |  |  |  |  | $ 27,540 | ¥ 188,639,400 |  |  |  |  |  |

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