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COMMITMENTS AND CONTINGENCIES - Contingencies (Details) - item
 1 Months Ended 12 Months Ended
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