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Fair Value of Financial Instruments - Financial Instruments Not Measured at Fair Value (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Fair Value of Financial Instruments |  |  |
Receivable from brokers and dealers and clearing organizations | $ 11,632 | $ 0 |
Deposits with clearing organizations | 23,906 | 20,523 |
Accounts receivable | 142,676 | 129,937 |
Total assets measured at fair value | 1,106,916 | 657,572 |
Payable to brokers and dealers and clearing organizations | 11,264 | 0 |
Equity investment without readily determinable fair value | 20,000 | 21,100 |
Income (loss) from investments | (1,000) | 0 | $ 0
Fair Value, Nonrecurring |  |  |
Fair Value of Financial Instruments |  |  |
Cash and restricted cash | 151,313 | 318,495 |
Receivable from brokers and dealers and clearing organizations | 11,632 | 0 |
Deposits with clearing organizations | 23,906 | 20,523 |
Accounts receivable | 142,676 | 129,937 |
Other assets – Memberships in clearing organizations | 2,406 | 2,392 |
Total assets measured at fair value | 331,933 | 471,347 |
Payable to brokers and dealers and clearing organizations | 11,264 | 0 |
Total | 11,264 | 0 |
Quoted Prices in active Markets for Identical Assets (Level 1) |  |  |
Fair Value of Financial Instruments |  |  |
Total assets measured at fair value | 1,106,916 | 654,553 |
Quoted Prices in active Markets for Identical Assets (Level 1) | Fair Value, Nonrecurring |  |  |
Fair Value of Financial Instruments |  |  |
Cash and restricted cash | 151,313 | 318,495 |
Receivable from brokers and dealers and clearing organizations | 0 | 0 |
Deposits with clearing organizations | 23,906 | 20,523 |
Accounts receivable | 0 | 0 |
Other assets – Memberships in clearing organizations | 0 | 0 |
Total assets measured at fair value | 175,219 | 339,018 |
Payable to brokers and dealers and clearing organizations | 0 | 0 |
Total | 0 | 0 |
Significant Observable Inputs (Level 2) |  |  |
Fair Value of Financial Instruments |  |  |
Total assets measured at fair value | 0 | 3,019 |
Significant Observable Inputs (Level 2) | Fair Value, Nonrecurring |  |  |
Fair Value of Financial Instruments |  |  |
Cash and restricted cash | 0 | 0 |
Receivable from brokers and dealers and clearing organizations | 11,632 | 0 |
Deposits with clearing organizations | 0 | 0 |
Accounts receivable | 142,676 | 129,937 |
Other assets – Memberships in clearing organizations | 0 | 0 |
Total assets measured at fair value | 154,308 | 129,937 |
Payable to brokers and dealers and clearing organizations | 11,264 | 0 |
Total | 11,264 | 0 |
Significant Unobservable Inputs (Level 3) |  |  |
Fair Value of Financial Instruments |  |  |
Total assets measured at fair value | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Fair Value, Nonrecurring |  |  |
Fair Value of Financial Instruments |  |  |
Cash and restricted cash | 0 | 0 |
Receivable from brokers and dealers and clearing organizations | 0 | 0 |
Deposits with clearing organizations | 0 | 0 |
Accounts receivable | 0 | 0 |
Other assets – Memberships in clearing organizations | 2,406 | 2,392 |
Total assets measured at fair value | 2,406 | 2,392 |
Payable to brokers and dealers and clearing organizations | 0 | 0 |
Total | 0 | 0 |
Total Fair Value | Fair Value, Nonrecurring |  |  |
Fair Value of Financial Instruments |  |  |
Cash and restricted cash | 151,313 | 318,495 |
Receivable from brokers and dealers and clearing organizations | 11,632 | 0 |
Deposits with clearing organizations | 23,906 | 20,523 |
Accounts receivable | 142,676 | 129,937 |
Other assets – Memberships in clearing organizations | 2,406 | 2,392 |
Total assets measured at fair value | 331,933 | 471,347 |
Payable to brokers and dealers and clearing organizations | 11,264 | 0 |
Total | $ 11,264 | $ 0 |

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- Definition Amount payable to other broker-dealer and clearing organization, including, but not limited to, security failed-to-receive, deposit received for security loaned, open transaction, and floor-brokerage payable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + Details
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