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Fair Value Measurements - Schedule of investments, categorized by the level of the fair value hierarchy (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Equity securities | $ 1,000 | $ 1,000
Private common equity securities | 3,000 |
Private preferred equity securities |  | 3,000
Total equities | 4,000 | 4,000
Asset-backed securities | 9,929 |
Bank debts | 423 |
Corporate bonds | 37,746 |
U.S. Treasury securities | 53,213 | 101,186
Sovereign debt |  | 23,885
Total debt securities | 101,311 | 125,071
Derivative assets | 1,153 |
Total assets | 106,464 | 129,071
Investments in funds valued at NAV | 1,055,618 | 860,630
Assets Including Alternative Investments, Fair Value Disclosure | 1,162,082 | 989,701
Liabilities |  |
Financial Instruments Sold, Not yet Purchased, US Government and Agency Obligations | 11,990 |
Securities sold, not yet purchased, at fair value | 11,990 | 0
Derivative liabilities (embedded) | 1,013 | 31
Total liabilities | 13,003 | 31
Quoted prices in active markets (Level 1) |  |
Assets |  |
Equity securities | 0 | 0
Private common equity securities | 0 |
Private preferred equity securities |  | 0
Total equities | 0 | 0
Asset-backed securities | 0 |
Bank debts | 0 |
Corporate bonds | 0 |
U.S. Treasury securities | 0 | 0
Sovereign debt |  | 0
Total debt securities | 0 | 0
Derivative assets | 0 |
Total assets | 0 | 0
Liabilities |  |
Financial Instruments Sold, Not yet Purchased, US Government and Agency Obligations | 0 |
Securities sold, not yet purchased, at fair value | 0 |
Derivative liabilities (embedded) | 0 | 0
Total liabilities | 0 | 0
Significant other observable inputs (Level 2) |  |
Assets |  |
Equity securities | 0 | 0
Private common equity securities | 0 |
Private preferred equity securities |  | 0
Total equities | 0 | 0
Asset-backed securities | 9,929 |
Bank debts | 423 |
Corporate bonds | 37,746 |
U.S. Treasury securities | 53,213 | 101,186
Sovereign debt |  | 23,885
Total debt securities | 101,311 | 125,071
Derivative assets | 0 |
Total assets | 101,311 | 125,071
Liabilities |  |
Financial Instruments Sold, Not yet Purchased, US Government and Agency Obligations | 11,990 |
Securities sold, not yet purchased, at fair value | 11,990 |
Derivative liabilities (embedded) | 0 | 0
Total liabilities | 11,990 | 0
Significant unobservable inputs (Level 3) |  |
Assets |  |
Equity securities | 1,000 | 1,000
Private common equity securities | 3,000 |
Private preferred equity securities |  | 3,000
Total equities | 4,000 | 4,000
Asset-backed securities | 0 |
Bank debts | 0 |
Corporate bonds | 0 |
U.S. Treasury securities | 0 | 0
Sovereign debt |  | 0
Total debt securities | 0 | 0
Derivative assets | 1,153 |
Total assets | 5,153 | 4,000
Liabilities |  |
Financial Instruments Sold, Not yet Purchased, US Government and Agency Obligations | 0 |
Securities sold, not yet purchased, at fair value | 0 |
Derivative liabilities (embedded) | 1,013 | 31
Total liabilities | $ 1,013 | $ 31

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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=117332851&loc=SL7495116-110257 + Details
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