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EQUITY-METHOD INVESTMENT (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
vote
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]      
Percentage of production offtake 66.66%    
Percentage of operating expenses to be absorbed 66.66%    
Number of votes | vote 2    
St. Gabriel CC Company, LLC      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage in joint venture 66.66%    
Loss relating to joint venture's expenses $ 575 $ 388 $ 569
Carrying value of joint venture $ 4,971 $ 4,513  
St. Gabriel CC Company, LLC | Eastman Chemical Company      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage in joint venture 33.34%