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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - PP&E Useful Life (Details)
12 Months Ended
Dec. 31, 2021
Furniture and fixtures  
Summary of significant accounting policies  
Property, plant and equipment, useful life 5 years
Office equipment  
Summary of significant accounting policies  
Property, plant and equipment, useful life 5 years
Computer hardware | Minimum  
Summary of significant accounting policies  
Property, plant and equipment, useful life 3 years
Computer hardware | Maximum  
Summary of significant accounting policies  
Property, plant and equipment, useful life 5 years
Computer software | Minimum  
Summary of significant accounting policies  
Property, plant and equipment, useful life 3 years
Computer software | Maximum  
Summary of significant accounting policies  
Property, plant and equipment, useful life 7 years
Leasehold improvements  
Summary of significant accounting policies  
Property, plant and equipment, useful life 10 years