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RELATED PARTY TRANSACTIONS - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Feb. 11, 2020
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Feb. 12, 2020
$ / shares
Related Party Transaction [Line Items]          
Equity interests (in usd per share) | $ / shares         $ 1.00
Ratio of percentage of stockholders' equity paid up to predetermined amount 0.000875        
Predetermined amount of stockholders equity used in calculating monthly management fee $ 17,280,000        
Ratio of percentage of stockholders' equity paid over a predetermined amount 0.0075        
Compensation and management fee   $ 31,518 $ 40,825 $ 40,800  
Management Agreement          
Related Party Transaction [Line Items]          
Reimbursement payments   $ 7,100