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EQUITY INVESTMENTS - Narrative Equity Method Investments (Details) $ in Thousands, ¥ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2021 CNY (¥) | Apr. 30, 2018 USD ($) | Feb. 28, 2018 USD ($) | Feb. 28, 2017 USD ($) | Apr. 30, 2018 USD ($) | Jan. 02, 2022 USD ($) | Jan. 03, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 29, 2019 USD ($) | Oct. 01, 2021 | Dec. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Nov. 30, 2015 MW | Dec. 31, 2013 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments without readily determinable fair value |  |  |  |  |  |  | $ 4,000 | $ 4,000 |  |  |  |  |  |  |  |
Payments to acquire additional interest in subsidiaries |  |  |  |  |  |  | 0 | 30,000 |  |  | $ 0 |  |  |  |  |
Gain on disposal |  |  |  |  |  |  | 2,975 | 0 |  |  | $ 0 |  |  |  |  |
Equity method investments |  |  |  |  |  |  | $ 11,230 | 25,707 |  |  |  |  |  |  |  |
Proceeds from sale of unconsolidated investee |  |  |  |  |  |  |  |  | $ 3,200 | ¥ 21.9 |  |  |  |  |  |
Huansheng Photovoltaic (Jiangsu) Co., Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments without readily determinable fair value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,200 |  |
Equity securities without readily determinable fair value, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |
Additional amount invested |  |  | $ 7,000 | $ 6,300 | $ 9,000 |  |  |  |  |  |  |  |  |  |  |
Amount invested, less reinvested dividends |  |  |  |  | 7,700 |  |  |  |  |  |  |  |  |  |  |
Reinvested dividends |  |  |  |  | $ 1,300 | $ 700 |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 20.00% | 20.00% | 20.00% |  | 20.00% | 20.00% | 16.30% |  |  |  |  | 16.30% |  |  |  |
Gain on disposal |  |  |  |  |  |  | $ 3,000 |  |  |  |  |  |  |  |  |
Gain on disposition of stock in equity method investee, reclassified from other comprehensive income to profit and loss |  |  |  |  |  |  | 30 |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  | 11,230 | 25,707 |  |  |  |  |  |  |  |
Huansheng Photovoltaic (Jiangsu) Co., Ltd. | Tianjin Zhonghuan Semiconductor Co., Ltd. (TZS) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire additional interest in subsidiaries | $ 41,600 | ¥ 270.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
CCPV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00%
Equity method investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,400
Deca Technologies, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments without readily determinable fair value |  |  |  |  |  |  | $ 4,000 | $ 4,000 |  |  |  |  |  |  |  |
Equity securities without readily determinable fair value, ownership percentage |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |
Proceeds from dividends received |  |  |  |  |  |  | $ 2,500 |  |  |  |  |  |  |  |  |
Equity securities, gain |  |  |  |  |  |  | $ 1,300 |  |  |  |  |  |  |  |  |
Hohhot |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments without readily determinable fair value |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,700 |  |  |
Equity securities without readily determinable fair value, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  | 4.60% |  |  |
Gain on disposal |  |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |
Power capacity (in mw) | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300 |

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