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Fair value measurements - Assets and Liabilities Not Measured at Fair Value on Recurring Basis (Details) - Fair Value, Nonrecurring - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Cash | $ 30,320 | $ 112,433
Restricted cash | 25,581 | 25,534
Deposits with clearing organization | 44,094 | 52,754
Securities borrowed | 256,508 | 127,817
Receivables from brokers | 72,942 | 49,125
Securities failed to deliver | 12,488 | 9,099
Clearing organizations and other | 19,099 | 20,035
Other |  | 0
Total Receivable from brokers, dealers and clearing organizations | 361,037 | 206,076
Receivable from customers | 1,054,316 | 1,202,764
Securities purchased under agreements to resell |  | 0
Notes receivable, net | 63,649 | 57,495
Investments | 83,302 | 79,322
Drafts payable | 18,024 |
Bank call loans | 19,300 | 0
Securities loaned | 368,101 | 320,843
Payable to brokers | 226 | 123
Securities failed to receive | 10,105 | 62,646
Clearing organization and other | 257,487 | 166,350
Total payables to brokers, dealers and clearing organizations | 635,919 | 549,962
Payables to customers | 458,588 | 456,475
Securities sold under agreements to repurchase | 280,436 | 161,009
Senior secured notes | 105,986 | 113,233
Level 1 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Cash | 30,320 | 112,433
Restricted cash | 25,581 | 25,534
Deposits with clearing organization | 44,094 | 52,754
Drafts payable | 18,024 |
Level 2 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Securities borrowed | 256,508 | 127,817
Receivables from brokers | 72,942 | 49,125
Securities failed to deliver | 12,488 | 9,099
Clearing organizations and other | 19,099 | 20,035
Other |  | 0
Total Receivable from brokers, dealers and clearing organizations | 361,037 | 206,076
Receivable from customers | 1,054,316 | 1,202,764
Securities purchased under agreements to resell |  | 0
Notes receivable, net | 63,649 | 57,495
Investments | 83,302 | 79,322
Bank call loans | 19,300 | 0
Securities loaned | 368,101 | 320,843
Payable to brokers | 226 | 123
Securities failed to receive | 10,105 | 62,646
Clearing organization and other | 257,487 | 166,350
Total payables to brokers, dealers and clearing organizations | 635,919 | 549,962
Payables to customers | 458,588 | 456,475
Securities sold under agreements to repurchase | 280,436 | 161,009
Senior secured notes | 105,986 | 113,233
Carrying Value |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Cash | 30,320 | 112,433
Restricted cash | 25,581 | 25,534
Deposits with clearing organization | 44,094 | 52,754
Securities borrowed | 256,508 | 127,817
Receivables from brokers | 72,942 | 49,125
Securities failed to deliver | 12,488 | 9,099
Clearing organizations and other | 19,099 | 20,035
Other |  | 0
Total Receivable from brokers, dealers and clearing organizations | 361,037 | 206,076
Receivable from customers | 1,054,316 | 1,202,764
Securities purchased under agreements to resell |  | 0
Notes receivable, net | 63,649 | 57,495
Investments | 83,302 | 79,322
Drafts payable | 18,024 |
Bank call loans | 19,300 | 0
Securities loaned | 368,101 | 320,843
Payable to brokers | 226 | 123
Securities failed to receive | 10,105 | 62,646
Clearing organization and other | 257,487 | 166,350
Total payables to brokers, dealers and clearing organizations | 635,919 | 549,962
Payables to customers | 458,588 | 456,475
Securities sold under agreements to repurchase | 280,436 | 161,009
Senior secured notes | $ 113,050 | $ 114,050

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