RELATED PARTY TRANSACTIONS - Performance-based incentive fee (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) component	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Related Party Transaction [Line Items]
Number of components | component			2
Incentive fee payables	$ 4,335		$ 4,335		$ 7,958
Total performance-based incentive fees	1,027	$ 2,069	4,291	$ 6,739
Income incentive fee	2,159	1,942	6,094	5,616
Capital gains incentive fee	(1,132)	127	(1,803)	1,123
Total performance-based incentive fees	1,027	$ 2,069	4,291	$ 6,739
Capital Gains Incentive Fees under GAAP
Related Party Transaction [Line Items]
Incentive fee payables	0		$ 0		$ 1,803
Investment adviser
Related Party Transaction [Line Items]
Number of components | component			2
Incentive fee payables	$ 0		$ 0