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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans Held-for-Investment, Net (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
loan
Loans Held-for-Investment, Net    
Number of loans held for investment | loan 22 14
Unpaid principal balance of loans held for investment $ 546.6 $ 503.5
Net unamortized deferred fees and costs 2.0 6.0
Allowance for loan losses 1.1 $ 0.2
Loans Held for Investment    
Transfers of financial assets accounted for as secured borrowings    
Loan portfolio transferred to third party 78.3  
Other Liabilities    
Transfers of financial assets accounted for as secured borrowings    
Secured borrowing $ 70.5  
Loans Held for Investment    
Loans Held-for-Investment, Net    
Number of delinquent loans | loan 1 0
Loans held for investment, delinquent $ 14.7 $ 0.0
Number of impaired loans | loan 1 0
Loans held for investment, impaired $ 14.7 $ 0.0
Number of loans on nonaccrual status | loan 1 0
Loans, non-accrual status $ 14.7 $ 0.0
Loans Held for Investment | Maximum    
Loans Held-for-Investment, Net    
Term of loans 3 years  
Subordinated Note Participation    
Loans Held-for-Investment, Net    
Unpaid principal balance of loans held for investment $ 7.8 $ 150.0