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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Equity Securities (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Cost | $ 47,507 |  | $ 63,383
Gross Unrealized Gain | 24,653 | $ 14,819 |
Gross Unrealized Loss | (7,649) | (16,594) |
Fair Value | 64,511 |  | 61,608
Equity securities - Life Sciences Portfolio |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Cost | 28,498 |  | 28,498
Gross Unrealized Gain | 21,978 | 14,815 |
Gross Unrealized Loss | (103) | (617) |
Fair Value | 50,373 |  | 42,696
Equity securities - other common stock |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Cost | 19,009 |  | 34,885
Gross Unrealized Gain | 2,675 | 4 |
Gross Unrealized Loss | (7,546) | $ (15,977) |
Fair Value | $ 14,138 |  | $ 18,912

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