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Consolidated Entities - ISP Fund LP (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | May 31, 2021 | May 20, 2021 | Dec. 31, 2020
CONSOLIDATED ENTITIES |  |  |  |  |  |  |  |
Total assets | $ 887,239 |  | $ 887,239 |  |  |  | $ 999,570 | [1]
Unrealized gain on equity investments |  |  | 132,485 | $ 39,245 |  |  |  |
Changes in fair values of equity and long-term investments | 33,613 | $ (29,368) | $ 133,973 | $ 39,245 |  |  |  |
ISP Fund LP |  |  |  |  |  |  |  |
CONSOLIDATED ENTITIES |  |  |  |  |  |  |  |
Contributed to partnership for investing |  |  |  |  |  |  | 300,000 |
Distribution from partnership |  |  |  |  | $ 110,000 |  |  |
Economic interest of the Partnership (in percent) |  |  | 100.00% |  |  |  |  |
Total assets | 228,900 |  | $ 228,900 |  |  |  | $ 299,300 |
Investment-related expenses, net of investment-related income | 200 |  | 1,500 |  |  |  |  |
Unrealized gain on equity investments | $ 10,100 |  | 30,600 |  |  |  |  |
Changes in fair values of equity and long-term investments |  |  | $ 10,500 |  |  |  |  |
Commitment for future contribution |  |  |  |  |  | $ 110,000 |  |
Lock-up period |  |  | 36 months |  |  |  |  |
[1] | Consolidated balance sheet as of December 31, 2020 has been derived from audited consolidated financial statements.

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