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INVESTMENT IN EQUITY SECURITIES - Narrative (Details)
€ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended 48 Months Ended
Apr. 01, 2020
USD ($)
Jan. 01, 2020
USD ($)
Nov. 30, 2020
USD ($)
Aug. 31, 2019
USD ($)
investment
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2009
EUR (€)
Dec. 31, 2020
USD ($)
Schedule of Equity Method Investments [Line Items]                      
Investment in unconsolidated affiliate           $ 39,628,000 $ 3,530,000 $ 10,000,000      
Income (Loss) from equity method investment           (1,443,000) 135,000 (229,000)      
Increase (decrease) in value of preferred equity stock investment           64,000 0 6,500,000      
Preferred equity stocks                      
Schedule of Equity Method Investments [Line Items]                      
Increase (decrease) in value of preferred equity stock investment               $ 6,500,000      
Sonmol                      
Schedule of Equity Method Investments [Line Items]                      
Investment in unconsolidated affiliate $ 5,000,000                    
Ownership percentage of equity method investment 30.00%                    
Equity method investments value         $ 5,598,000 5,598,000 0       $ 5,598,000
BTY                      
Schedule of Equity Method Investments [Line Items]                      
Investment in unconsolidated affiliate   $ 32,000,000                  
Ownership percentage of equity method investment   49.00%                  
Equity method investments value         33,020,000 33,020,000 119,000       33,020,000
Initial lock-up period (in years)   5 years                  
Second lock-up period (in years)   3 years                  
BTY | Minimum | Call Option                      
Schedule of Equity Method Investments [Line Items]                      
Ownership percentage of equity method investment   26.00%                  
BTY | Maximum | Call Option                      
Schedule of Equity Method Investments [Line Items]                      
Ownership percentage of equity method investment   31.00%                  
Kali Care                      
Schedule of Equity Method Investments [Line Items]                      
Investment in unconsolidated affiliate                 $ 5,000,000    
Ownership percentage of equity method investment                 20.00%    
Equity method investments value         535,000 535,000 3,881,000       535,000
Income (Loss) from equity method investment                     (1,500,000)
Investment impairment         3,000,000.0            
Investment impairment, net         2,300,000            
Desotec GmbH                      
Schedule of Equity Method Investments [Line Items]                      
Investment in unconsolidated affiliate | €                   € 574  
Ownership percentage of equity method investment                   23.00%  
Equity method investments value         $ 964,000 964,000 $ 858,000       $ 964,000
Loop and Purecycle | Preferred equity stocks                      
Schedule of Equity Method Investments [Line Items]                      
Investment in unconsolidated affiliate       $ 3,500,000              
Number of preferred equity investments | investment       2              
Increase (decrease) in value of preferred equity stock investment           1,400,000          
PureCycle                      
Schedule of Equity Method Investments [Line Items]                      
Investment impairment           0          
PureCycle | Preferred equity stocks                      
Schedule of Equity Method Investments [Line Items]                      
Increase (decrease) in value of preferred equity stock investment     $ 3,100,000                
Equity received in exchange for services           $ 333,000