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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 |  |  |  |  |  |

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