DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule Of Concentration Of Credit Risk (Details) - Customer Concentration Risk - Revenue Benchmark |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Citadel Securities, LLC | |||
| Concentration Risk [Line Items] | |||
| Concentration risk, percentage | 22.00% | 34.00% | 29.00% |
| Tai Mo Shan Limited | |||
| Concentration Risk [Line Items] | |||
| Concentration risk, percentage | 15.00% | 0.00% | 0.00% |
| Entities affiliated with Susquehanna International Group, LLP | |||
| Concentration Risk [Line Items] | |||
| Concentration risk, percentage | 12.00% | 18.00% | 13.00% |
| Entities affiliated with Wolverine Holdings, L.P. | |||
| Concentration Risk [Line Items] | |||
| Concentration risk, percentage | 10.00% | 10.00% | 12.00% |
| All others individually less than 10% | |||
| Concentration Risk [Line Items] | |||
| Concentration risk, percentage | 18.00% | 13.00% | 8.00% |
| Total as percentage of total revenue | |||
| Concentration Risk [Line Items] | |||
| Concentration risk, percentage | 77.00% | 75.00% | 62.00% |