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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - SCHEDULE OF CONCENTRATION OF CREDIT RISK (Details) - Customer Concentration Risk - Revenue Benchmark
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Citadel Securities, LLC    
Concentration Risk [Line Items]    
Concentration risk, percentage 22.00% 27.00%
Entities affiliated with Susquehanna International Group, LLP    
Concentration Risk [Line Items]    
Concentration risk, percentage 12.00% 12.00%
Entities affiliated with Wolverine Holdings, L.P.    
Concentration Risk [Line Items]    
Concentration risk, percentage 10.00% 9.00%
All others individually less than 10%    
Concentration Risk [Line Items]    
Concentration risk, percentage 28.00% 33.00%
Total as percentage of total revenue    
Concentration Risk [Line Items]    
Concentration risk, percentage 72.00% 81.00%