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Marketable Securities (Details) - USD ($) |  |  |  |  |  | 3 Months Ended | 36 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 02, 2021 | Jun. 25, 2021 | Nov. 30, 2020 | Dec. 02, 2019 | Jun. 28, 2013 | Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2020 | Dec. 31, 2022 | Jun. 30, 2021 | Nov. 30, 2019
Marketable Securities |  |  |  |  |  |  |  |  |  |  |
Shares settled (in shares) | 944,329 |  | 741,505 | 898,685 |  |  |  |  |  |  |
Investment owned shares settled fair value | $ 166,000,000 |  | $ 93,500,000 | $ 93,500,000 |  |  |  |  |  |  |
Shares owned (in shares) | 5,278,011 |  | 250,742 | 93,562 |  |  |  |  |  |  |
Gross proceeds from sale of marketable securities |  |  |  |  |  | $ 0 | $ 437,820,000 |  |  |  |
Gain (loss) on marketable securities |  |  |  |  |  | 0 | (7,470,000) |  |  |  |
Unrealized gain (loss) on marketable securities |  |  |  |  |  | (346,000) | $ (80,130,000) |  |  |  |
Marketable securities |  |  |  |  |  | $ 441,000 |  |  | $ 788,000 |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Marketable Securities |  |  |  |  |  |  |  |  |  |  |
Amount recognized in connection with the earn-out including other income (loss) (in shares) |  |  |  |  |  |  |  | 992,247 |  |  |
Common Stock | Nasdaq |  |  |  |  |  |  |  |  |  |  |
Marketable Securities |  |  |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |  | $ 1,093,900,000 |
Number of shares sold in transaction (in shares) |  |  |  |  |  | 0 | 2,497,831 |  |  |  |
Gross proceeds from sale of marketable securities |  |  |  |  |  |  | $ 437,800,000 |  |  |  |
Gain (loss) on marketable securities |  |  |  |  |  | $ 0 | (7,500,000) |  |  |  |
Unrealized gain (loss) on marketable securities |  |  |  |  |  | 0 | (80,100,000) |  |  |  |
Common Stock | Securites In Public Entities |  |  |  |  |  |  |  |  |  |  |
Marketable Securities |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on marketable securities |  |  |  |  |  | $ (400,000) | $ 0 |  |  |  |
Common Stock | Nasdaq Earn-Out |  |  |  |  |  |  |  |  |  |  |
Marketable Securities |  |  |  |  |  |  |  |  |  |  |
Shares settled (in shares) | 944,329 | 6,222,340 |  |  |  |  |  |  |  |  |
Marketable securities | $ 166,000,000 |  | $ 121,900,000 |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |  |  | $ 98,600,000
Maximum | Common Stock |  |  |  |  |  |  |  |  |  |  |
Marketable Securities |  |  |  |  |  |  |  |  |  |  |
Remaining earn-out receivable under common stock transaction (in shares) |  |  |  |  | 6,945,729 |  |  |  |  |  |
Minimum | Common Stock |  |  |  |  |  |  |  |  |  |  |
Marketable Securities |  |  |  |  |  |  |  |  |  |  |
Gross revenue on earn-out receivable per year under common stock transaction |  |  |  |  | $ 25,000,000 |  |  |  |  |  |
BGC Partners Inc | Common Stock |  |  |  |  |  |  |  |  |  |  |
Marketable Securities |  |  |  |  |  |  |  |  |  |  |
Period for earn-out receivable under common stock transaction |  |  |  |  | 7 years |  |  |  |  |  |
BGC Partners Inc | Nasdaq Omx |  |  |  |  |  |  |  |  |  |  |
Marketable Securities |  |  |  |  |  |  |  |  |  |  |
Period for earn-out receivable under common stock transaction |  |  |  |  | 15 years |  |  |  |  |  |
BGC Partners Inc | Nasdaq Omx | Maximum |  |  |  |  |  |  |  |  |  |  |
Marketable Securities |  |  |  |  |  |  |  |  |  |  |
Earn-out shares receivable under common stock transaction (in shares) |  |  |  |  | 14,883,705 |  |  |  |  |  |
BGC Partners Inc | Nasdaq Omx | Minimum |  |  |  |  |  |  |  |  |  |  |
Marketable Securities |  |  |  |  |  |  |  |  |  |  |
Gross revenue on earn-out receivable per year under common stock transaction |  |  |  |  | $ 25,000,000 |  |  |  |  |  |

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