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INVESTMENT AT FAIR VALUE - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investment Holdings [Line Items]          
Realized gain (loss) on investment $ 207,186 $ 183,525      
Veritone Common Stock          
Investment Holdings [Line Items]          
Investment owned, balance (in shares) 0        
Investment shares sold   298,450 1,121,071 2,700,000  
Realized gain (loss) on investment   $ (3,300) $ (9,200) $ (19,100)  
Veritone Warrants          
Investment Holdings [Line Items]          
Investment owned, balance (in shares) 0        
Realized gain (loss) on investment $ 3,600 $ 11,500      
Warrants exercised 156,720 963,712      
Veritone          
Investment Holdings [Line Items]          
Exercise price (USD per share)         $ 13.61
Veritone | Common Stock          
Investment Holdings [Line Items]          
Investment owned, balance (in shares)         4,119,521
Veritone | Warrant          
Investment Holdings [Line Items]          
Investment owned, balance (in shares)         1,120,432