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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Schedule of investments, categorized by the level of the fair value hierarchy | The following tables present the Company’s investments, categorized by the level of the fair value hierarchy as of December 31, 2020 and 2019:
| December 31, 2020
| Quoted prices in active markets |  | Significant other observable inputs |  | Significant unobservable inputs |  | Total
| (Level 1) |  | (Level 2) |  | (Level 3) |
Assets |
Private common equity securities | $ | — |  |  | $ | — |  |  | $ | 1,000 |  |  | $ | 1,000 |
Private preferred equity securities | — |  |  | — |  |  | 3,000 |  |  | 3,000 |
Total equities | — |  |  | — |  |  | 4,000 |  |  | 4,000 |
Asset-backed securities | — |  |  | 9,929 |  |  | — |  |  | 9,929 |
Bank debt | — |  |  | 423 |  |  | — |  |  | 423 |
Corporate bonds | — |  |  | 37,746 |  |  | — |  |  | 37,746 |
U.S. Treasury securities | — |  |  | 53,213 |  |  | — |  |  | 53,213 |
Total debt securities | — |  |  | 101,311 |  |  | — |  |  | 101,311 |
Derivative assets | — |  |  | — |  |  | 1,153 |  |  | 1,153 |
| $ | — |  |  | $ | 101,311 |  |  | $ | 5,153 |  |  | 106,464 |
Investments in funds valued at NAV |  |  |  |  |  |  | 1,055,618 |
Total assets |  |  |  |  |  |  | $ | 1,162,082 |
Liabilities |  |  |  |  |  |  |
U.S. Treasury securities | $ | — |  |  | $ | 11,990 |  |  | $ | — |  |  | $ | 11,990 |
Total securities sold, not yet purchased | — |  |  | 11,990 |  |  | — |  |  | 11,990 |
Derivative liabilities | — |  |  | — |  |  | 1,013 |  |  | 1,013 |
Total liabilities | $ | — |  |  | $ | 11,990 |  |  | $ | 1,013 |  |  | $ | 13,003 |
| December 31, 2019
| Quoted prices in active markets |  | Significant other observable inputs |  | Significant unobservable inputs |  | Total
| (Level 1) |  | (Level 2) |  | (Level 3) |
Assets |
Private common equity securities | $ | — |  |  | $ | — |  |  | $ | 1,000 |  |  | $ | 1,000 |
Private preferred equity securities | — |  |  | — |  |  | 3,000 |  |  | 3,000 |
Total equities | — |  |  | — |  |  | 4,000 |  |  | 4,000 |
U.S. Treasury securities | — |  |  | 101,186 |  |  | — |  |  | 101,186 |
Sovereign debt | — |  |  | 23,885 |  |  | — |  |  | 23,885 |
Total debt securities | — |  |  | 125,071 |  |  | — |  |  | 125,071 |
| $ | — |  |  | $ | 125,071 |  |  | $ | 4,000 |  |  | 129,071 |
Investments in funds valued at NAV |  |  |  |  |  |  | 860,630 |
Total assets |  |  |  |  |  |  | $ | 989,701 |
Liabilities |  |  |  |  |  |  |
Derivative liabilities | $ | — |  |  | $ | — |  |  | $ | 31 |  |  | $ | 31 |
Total liabilities | $ | — |  |  | $ | — |  |  | $ | 31 |  |  | $ | 31 |
Schedule of reconciliation of the balances for all investments measured at fair value using significant unobservable inputs | The following table presents the reconciliation of all investments measured at fair value using Level 3 inputs for the years ended December 31, 2020 and 2019:
| January 1, 2020 |  | Transfers in to (out of) Level 3 |  | Purchases |  | Sales |  | Realized and Unrealized Gains(Losses) (1) |  | December 31, 2020
Assets |  |  |  |  |  |  |  |  |  |  |
Private common equity securities | $ | 1,000 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,000 |
Private preferred equity securities | 3,000 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 3,000 |
Derivative assets | — |  |  | — |  |  | — |  |  | — |  |  | 1,153 |  |  | 1,153 |
Total assets | $ | 4,000 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,153 |  |  | $ | 5,153 |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Derivative liabilities | $ | (31) |  |  | $ | — |  |  | $ | — |  |  | $ | (1,004) |  |  | $ | 22 |  |  | $ | (1,013) |
Total liabilities | $ | (31) |  |  | $ | — |  |  | $ | — |  |  | $ | (1,004) |  |  | $ | 22 |  |  | $ | (1,013) |
| January 1, 2019 |  | Transfers in to (out of) Level 3 |  | Purchases |  | Sales |  | Realized and Unrealized Gains(Losses)(1) |  | December 31, 2019
Assets |  |  |  |  |  |  |  |  |  |  |
Private common equity securities | $ | — |  |  | $ | — |  |  | $ | 1,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,000 |
Private preferred equity securities | — |  |  | — |  |  | 3,000 |  |  | — |  |  | — |  |  | 3,000 |
Total assets | $ | — |  |  | $ | — |  |  | $ | 4,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,000 |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Derivative liabilities | $ | (22) |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (9) |  |  | $ | (31) |
Total liabilities | $ | (22) |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (9) |  |  | $ | (31) |
(1)Total change in realized and unrealized gains (losses) recorded on Level 3 financial instruments is included in net investment income in the consolidated statements of income (loss). Realized and unrealized gains (losses) related to underwriting-related derivative assets and liabilities are included in other expenses, net of foreign exchange (gains) losses, in the consolidated statements of income (loss).

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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