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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans Held-for-Investment, Net (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
Loans Held-for-Investment, Net      
Number of loans held for investment | loan 12 18  
Unpaid principal balance of loans held for investment $ 274.5 $ 366.3  
Net unamortized deferred fees and costs 1.2 1.1  
Allowance for loan losses $ 4.2 $ 4.8  
Reasonable and supportable forecast period used for determining CECL reserves 1 year    
Charge off rate for forecasted period 0.03% 0.06%  
Charge off rate for the remaining period 0.02%    
Loans Held for Investment      
Transfers of financial assets accounted for as secured borrowings      
Loan portfolio transferred to third party   $ 81.5  
Other Liabilities      
Transfers of financial assets accounted for as secured borrowings      
Secured borrowing   $ 73.3  
Loans Held for Investment      
Loans Held-for-Investment, Net      
Number of delinquent loans | loan 1 1  
Charge off rate for forecasted period 0.15% 0.36%  
Charge off rate for the remaining period 0.09% 0.09%  
Loans held for investment, delinquent $ 14.7 $ 14.7  
Number of loans on nonaccrual status | loan 1 1  
Loans, non-accrual status $ 14.7 $ 14.7  
Specific reserve for loan 3.7 3.7  
Amortized cost of loans held for investment, current 258.6 350.5  
Loans originated in 2021 $ 231.5    
Loans originated in 2020   $ 0.0  
Loans originated in 2019     $ 28.3
Loans Held for Investment | Maximum      
Loans Held-for-Investment, Net      
Term of loans 3 years