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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Estimated Useful Lives and Components of Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Total leasehold improvements and equipment $ 4,459 $ 4,033
Accumulated depreciation and amortization (1,591) (712)
Leasehold improvements and equipment, net 2,868 3,321
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total leasehold improvements and equipment $ 3,498 3,276
Leasehold improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives (in years) 10 years  
Computer and other equipment    
Property, Plant and Equipment [Line Items]    
Total leasehold improvements and equipment $ 961 $ 757
Computer and other equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives (in years) 2 years  
Computer and other equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives (in years) 10 years