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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Equity Securities (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Cost | $ 156,768 |  | $ 99,859
Gross Unrealized Gain | 104,075 | $ 264,879 |
Gross Unrealized Loss | (14,359) | (2,960) |
Fair Value | 246,484 |  | 361,778
Equity securities - Life Sciences Portfolio (Note 3) |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Cost | 48,279 |  | 56,037
Gross Unrealized Gain | 92,253 | 262,811 |
Gross Unrealized Loss | (2,570) | (1,488) |
Fair Value | 137,962 |  | 317,360
Equity securities - other common stock |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Cost | 108,489 |  | 43,822
Gross Unrealized Gain | 11,822 | 2,068 |
Gross Unrealized Loss | (11,789) | $ (1,472) |
Fair Value | $ 108,522 |  | $ 44,418

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