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EQUITY SECURITIES PORTFOLIO INVESTMENT - Narrative (Details)
$ in Thousands, £ in Millions
3 Months Ended 6 Months Ended
Apr. 03, 2020
USD ($)
Apr. 03, 2020
GBP (£)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 03, 2020
Offsetting Liabilities [Line Items]                
Fair value of investment     $ 18,174   $ 18,174   $ 63,068  
Net loss including noncontrolling interests in subsidiaries     (8,446) $ (18,779) (8,632) $ (9,332)    
Net income attributable to noncontrolling interests in subsidiaries     (383) $ 0 (386) $ 0    
Life Sciences Portfolio                
Offsetting Liabilities [Line Items]                
Investment at fair value     25,700   25,700   $ 82,800  
Arix                
Offsetting Liabilities [Line Items]                
Fair value of investment     $ 0   0      
MalinJ1                
Offsetting Liabilities [Line Items]                
Ownership percentage               63.90%
Earnings on equity investment in joint venture         $ 0      
MalinJ1 | MalinJ1                
Offsetting Liabilities [Line Items]                
Equity method investment ownership     41.00%   41.00%      
Option Agreement | Portfolio Companies                
Offsetting Liabilities [Line Items]                
Payments to acquire investments $ 277,500 £ 223.9