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RELATED PARTY TRANSACTIONS - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Related Party Transaction [Line Items]        
Personnel expense $ 449,152 $ 441,818 $ 1,523,012 $ 1,022,734
Shareholder        
Related Party Transaction [Line Items]        
Management fees   200 200 800
Consulting Fees 16   57  
Personnel expense $ 78 $ 51 $ 300 $ 200