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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

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