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ORGANIZATION AND PRINCIPAL ACTIVITIES (Narrative) (Details) $ in Thousands, ¥ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 CNY (¥)
Proceeds from issuance of common stock | $ 224,553 |  |  |  |  |
Transfer of equity interest in subsidiaries to non-controlling shareholders | 224,553 |  |  | $ 10,470 |  |
Proceeds from Noncontrolling Interests | $ 261,332 |  | $ 11,488 | $ 10,470 |  |
Percentage of discount on Issue of Shares | 30.00% | 30.00% |  |  |  |
Premium (Discount) on Issue of Shares | $ 768,000 | ¥ 5,250 |  |  |  |
Proceeds from Subscription Advances | 36,342 |  |  |  |  |
Other Payables [Member] |  |  |  |  |  |
Proceeds from Subscription Advances | 36,342 |  |  |  |  |
Canadian Solar Employees |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | $ 4,500 | ¥ 31 |  |  |  |
Canadian Solar |  |  |  |  |  |
Ownership Percentage by Noncontrolling Owners | 20.40% | 20.40% |  |  |  |
Canadian Solar | Third-Party Investors |  |  |  |  |  |
Stock Issued During Period, Value, Employee Stock Ownership Plan | $ 36,342 | ¥ 248 |  |  |  |
CSI Solar Co |  |  |  |  |  |
Capital Raising Announced |  |  |  |  | $ 261,332 | ¥ 1,780
Business Combination, Consideration Transferred | 219,000 | 1,500 |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | $ 1,100,000 | ¥ 7,500 |  |  |  |

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