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BUSINESS AND BASIS OF PRESENTATION (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Dec. 31, 2020
segment
item
Vote
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Number of vote per share | Vote   1    
Number of equity method investee   0 0  
Number of cost-method investee   1 1  
Number of investment in notes receivable   1    
Number of investment in publicly traded securities   1    
Fair value of cost method investee | $ $ 500      
Impairment of cost-method investment | $ $ 2,000     $ 2,000
Number of operating segments | segment   3    
Cumulative translation adjustment | $     $ 400