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EQUITY SECURITIES PORTFOLIO INVESTMENT - Summary of Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 24,898 | $ 33,423
Gross Unrealized Gain | 118 | 29,680
Gross Unrealized Loss | (1,881) | (35)
Fair Value | 23,135 | 63,068
Equity securities - Life Sciences Portfolio |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost |  | 28,498
Gross Unrealized Gain |  | 28,600
Gross Unrealized Loss |  | (20)
Fair Value |  | 57,078
Equity securities - other common stock |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 24,898 | 4,925
Gross Unrealized Gain | 118 | 1,080
Gross Unrealized Loss | (1,881) | (15)
Fair Value | $ 23,135 | $ 5,990

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