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EQUITY SECURITIES PORTFOLIO INVESTMENT - Summary of Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 33,423 | $ 63,383
Gross Unrealized Gain | 29,680 | 14,819
Gross Unrealized Loss | (35) | (16,594)
Fair Value | 63,068 | 61,608
Equity securities - Life Sciences Portfolio |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 28,498 | 28,498
Gross Unrealized Gain | 28,600 | 14,815
Gross Unrealized Loss | (20) | (617)
Fair Value | 57,078 | 42,696
Equity securities - other common stock |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 4,925 | 34,885
Gross Unrealized Gain | 1,080 | 4
Gross Unrealized Loss | (15) | (15,977)
Fair Value | $ 5,990 | $ 18,912

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