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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Equity Securities (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Cost | $ 85,666 |  | $ 99,859
Gross Unrealized Gain | 19,240 | $ 264,879 |
Gross Unrealized Loss | (23,522) | (2,960) |
Fair Value | 81,384 |  | 361,778
Equity securities - Life Sciences Portfolio (Note 3) |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Cost | 38,066 |  | 56,037
Gross Unrealized Gain | 19,232 | 262,811 |
Gross Unrealized Loss | (1,014) | (1,488) |
Fair Value | 56,284 |  | 317,360
Equity securities - other common stock |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Cost | 47,600 |  | 43,822
Gross Unrealized Gain | 8 | 2,068 |
Gross Unrealized Loss | (22,508) | $ (1,472) |
Fair Value | $ 25,100 |  | $ 44,418

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