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Fair value measurements - Assets and Liabilities Not Measured at Fair Value on Recurring Basis (Details) - Nonrecurring - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | $ 28,835 | $ 112,433
Restricted cash |  | 25,534
Deposits with clearing organization | 43,917 | 52,754
Securities borrowed | 158,612 | 127,817
Receivables from brokers | 65,639 | 49,125
Securities failed to deliver | 29,656 | 9,099
Clearing organizations and Other | 30,780 | 20,035
Total Receivable from brokers, dealers and clearing organizations | 284,687 | 206,076
Receivable from customers | 1,059,892 | 1,202,764
Notes receivable, net | 62,640 | 57,495
Investments | 90,999 | 79,322
Drafts payable | 9,002 |
Securities loaned | 284,987 | 320,843
Payable to brokers | 447 | 123
Securities failed to receive | 23,809 | 62,646
Clearing Organizations and Other | 51,912 | 166,350
Total payables to brokers, dealers and clearing organizations | 361,155 | 549,962
Payables to customers | 369,287 | 456,475
Securities sold under agreements to repurchase | 640,382 | 161,009
Senior secured notes | 109,838 | 113,233
Underlying investment | 89,000 | 77,000
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 28,835 | 112,433
Restricted cash |  | 25,534
Deposits with clearing organization | 43,917 | 52,754
Securities borrowed | 0 | 0
Receivables from brokers | 0 | 0
Securities failed to deliver | 0 | 0
Clearing organizations and Other | 0 | 0
Total Receivable from brokers, dealers and clearing organizations | 0 | 0
Receivable from customers | 0 | 0
Notes receivable, net | 0 | 0
Investments | 0 | 0
Drafts payable | 9,002 |
Securities loaned | 0 | 0
Payable to brokers | 0 | 0
Securities failed to receive | 0 | 0
Clearing Organizations and Other | 0 | 0
Total payables to brokers, dealers and clearing organizations | 0 | 0
Payables to customers | 0 | 0
Securities sold under agreements to repurchase | 0 | 0
Senior secured notes | 0 | 0
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 0 | 0
Restricted cash |  | 0
Deposits with clearing organization | 0 | 0
Securities borrowed | 158,612 | 127,817
Receivables from brokers | 65,639 | 49,125
Securities failed to deliver | 29,656 | 9,099
Clearing organizations and Other | 30,780 | 20,035
Total Receivable from brokers, dealers and clearing organizations | 284,687 | 206,076
Receivable from customers | 1,059,892 | 1,202,764
Notes receivable, net | 62,640 | 57,495
Investments | 90,999 | 79,322
Drafts payable | 0 |
Securities loaned | 284,987 | 320,843
Payable to brokers | 447 | 123
Securities failed to receive | 23,809 | 62,646
Clearing Organizations and Other | 51,912 | 166,350
Total payables to brokers, dealers and clearing organizations | 361,155 | 549,962
Payables to customers | 369,287 | 456,475
Securities sold under agreements to repurchase | 640,382 | 161,009
Senior secured notes | 109,838 | 113,233
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 0 | 0
Restricted cash |  | 0
Deposits with clearing organization | 0 | 0
Securities borrowed | 0 | 0
Receivables from brokers | 0 | 0
Securities failed to deliver | 0 | 0
Clearing organizations and Other | 0 | 0
Total Receivable from brokers, dealers and clearing organizations | 0 | 0
Receivable from customers | 0 | 0
Notes receivable, net | 0 | 0
Investments | 0 | 0
Drafts payable | 0 |
Securities loaned | 0 | 0
Payable to brokers | 0 | 0
Securities failed to receive | 0 | 0
Clearing Organizations and Other | 0 | 0
Total payables to brokers, dealers and clearing organizations | 0 | 0
Payables to customers | 0 | 0
Securities sold under agreements to repurchase | 0 | 0
Senior secured notes | 0 | 0
Carrying Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 28,835 | 112,433
Restricted cash |  | 25,534
Deposits with clearing organization | 43,917 | 52,754
Securities borrowed | 158,612 | 127,817
Receivables from brokers | 65,639 | 49,125
Securities failed to deliver | 29,656 | 9,099
Clearing organizations and Other | 30,780 | 20,035
Total Receivable from brokers, dealers and clearing organizations | 284,687 | 206,076
Receivable from customers | 1,059,892 | 1,202,764
Notes receivable, net | 62,640 | 57,495
Investments | 90,999 | 79,322
Drafts payable | 9,002 |
Securities loaned | 284,987 | 320,843
Payable to brokers | 447 | 123
Securities failed to receive | 23,809 | 62,646
Clearing Organizations and Other | 51,912 | 166,350
Total payables to brokers, dealers and clearing organizations | 361,155 | 549,962
Payables to customers | 369,287 | 456,475
Securities sold under agreements to repurchase | 640,382 | 161,009
Senior secured notes | $ 113,050 | $ 114,050

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