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COMMITMENTS AND CONTINGENCIES - Contingencies (Details) - item |  |  | 1 Months Ended | 12 Months Ended
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Jan. 21, 2015 | Nov. 30, 2012 | Mar. 31, 2021 | Dec. 31, 2020 | Aug. 31, 2020 | Jul. 31, 2020 | May 31, 2020 | Apr. 30, 2020 | Dec. 31, 2019 | Aug. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Feb. 28, 2019 | Oct. 31, 2018 | Sep. 30, 2018 | Jul. 31, 2018 | Jun. 30, 2018 | Oct. 31, 2017 | Sep. 30, 2017 | Jul. 31, 2017 | Jul. 31, 2016 | Jun. 30, 2016 | May 31, 2016 | Jul. 31, 2015 | Dec. 31, 2020 | Dec. 31, 2010
Solar 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash deposit rate for anti-dumping duty on CSPV cells imported from China (as a percent) |  | 13.94% |  | 95.50% |  |  | 3.19% | 4.12% |  | 4.06% |  |  |  | 13.07% |  | 13.07% |  | 13.07% | 8.52% |  | 3.96% | 8.52% | 9.67% | 9.67% |  |
Cash deposit rate for countervailing duty on CSPV cells imported from China (as a percent) |  | 15.24% | 11.97% | 12.67% | 7.36% | 18.16% |  |  | 9.70% | 9.70% |  |  |  | 11.59% | 18.16% |  |  | 18.16% | 20.94% |  | 20.94% |  |  | 20.94% | 5.02% |
Solar 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of sunset reviews |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Cash deposit rate for anti-dumping duty on CSPV cells imported from China (as a percent) | 30.06% |  |  |  |  |  |  | 30.06% | 30.06% |  | 30.06% |  |  |  |  |  | 30.06% |  |  | 30.06% |  |  |  |  |  |
Cash deposit rate for countervailing duty on CSPV cells imported from China (as a percent) | 38.43% |  |  |  |  |  |  | 33.58% | 33.58% |  | 33.58% | 33.58% | 38.43% |  |  |  | 33.58% |  |  | 33.58% |  |  |  |  |  |
Duty rate for anti-dumping duty on CSPV cells imported from Taiwan (as a percent) |  |  |  |  |  |  |  |  | 2.57% |  | 4.39% |  |  |  |  |  | 1.33% |  |  |  |  |  |  |  |  |
Solar 2 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash deposit rate for anti-dumping duty on CSPV cells imported from China (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.56% |  |  |  |  |  |
Duty rate for anti-dumping duty on CSPV cells imported from Taiwan (as a percent) |  |  |  |  |  |  |  |  |  |  | 1.52% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Solar 2 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duty rate for anti-dumping duty on CSPV cells imported from Taiwan (as a percent) |  |  |  |  |  |  |  |  |  |  | 3.78% |  |  |  |  |  |  |  |  | 4.20% |  |  |  |  |  |
Class Action Lawsuits Filed in New York |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of subpoenas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Number of lawsuits filed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6

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- Definition Represents the cash deposit rate for anti-dumping duty on CSPV cells imported from China on or after a specified date. + References No definition available. + Details
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- Definition Represents the cash deposit rate for countervailing duty on CSPV cells imported from China on or after a specified date. + References No definition available. + Details
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- Definition Represents the duty rate for anti-dumping duty on CSPV cells imported from Taiwan on or after a specified date. + References No definition available. + Details
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- Definition Period covered by the sunset reviews conducted by USDOC and USITC, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 + Details
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