Quarterly report pursuant to Section 13 or 15(d)

OTHER NONCURRENT ASSETS - Change in the balance of other investments (Details)

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OTHER NONCURRENT ASSETS - Change in the balance of other investments (Details) - USD ($)
$ in Thousands
 1 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Net Investment Income [Line Items]      
Other investments   $ 7,137 $ 3,000
Net unrealized (gain) loss on investments   (4)  
Convertible Debt      
Net Investment Income [Line Items]      
Other investments     $ 3,000
Percentage of annual interest rate     3.00%
Period of annual interest due     2 years
Net unrealized (gain) loss on investments   $ 300  
Convertible Promissory Note one      
Net Investment Income [Line Items]      
Other investments $ 1,600    
Percentage of annual interest rate 3.00%    
Period of annual interest due 2 years    
Net unrealized (gain) loss on investments $ 200    
Convertible Promissory Note two      
Net Investment Income [Line Items]      
Other investments $ 2,000    
Percentage of annual interest rate 3.00%    
Period of annual interest due 5 years    
Change in fair value, net $ 0