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EQUITY SECURITIES PORTFOLIO INVESTMENT (Tables) | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Unrealized Gain (Loss) on Investments | Equity securities at fair value for the periods presented were comprised of the following:
Security Type |  | Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value
|  | (In thousands)
December 31, 2021: |  |  |  |  |  |  |  |
Equity securities - Life Sciences Portfolio (Note 4) |  | $ | 56,037 |  |  | $ | 262,811 |  |  | $ | (1,488) |  |  | $ | 317,360 |
Equity securities |  | 43,822 |  |  | 2,068 |  |  | (1,472) |  |  | 44,418 |
Total |  | $ | 99,859 |  |  | $ | 264,879 |  |  | $ | (2,960) |  |  | $ | 361,778 |
December 31, 2020: |  |  |  |  |  |  |  |
Equity securities - Life Sciences Portfolio (Note 4) |  | $ | 32,765 |  |  | $ | 72,689 |  |  | $ | (583) |  |  | $ | 104,871 |
Equity securities |  | 4,086 |  |  | 1,410 |  |  | (1,264) |  |  | 4,232 |
Total |  | $ | 36,851 |  |  | $ | 74,099 |  |  | $ | (1,847) |  |  | $ | 109,103 |
The consolidated statements of operations reflected the following net realized and unrealized gains from our Life Sciences Portfolio:
| Years Ended December 31,
| 2021 |  | 2020
| (In thousands)
Change in fair value of equity securities of public companies | $ | 188,875 |  |  | $ | 72,104 |
Change in fair value of equity securities without readily determinable fair value | — |  |  | 103,751 |
Conversion of equity securities without readily determinable fair value to equity securities of public companies | (102,067) |  |  | — |
Gain (loss) on sale of equity securities of public companies | 115,172 |  |  | (3,930) |
Gain on sale of prepaid investment and derivative | — |  |  | 2,845 |
Net realized and unrealized gain | $ | 201,980 |  |  | $ | 174,770 |

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