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ACCOUNTS RECEIVABLE - Schedule of components of accounts receivable, net (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Receivables [Abstract]    
Accounts receivable $ 39,656 $ 39,045
Investment banking fees, commissions and other receivables 8,169 14,286
Total accounts receivable 47,825 53,331
Allowance for doubtful accounts (3,103) (3,658)
Accounts receivable, net $ 44,722 $ 49,673