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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans Held-for-Investment, Net (Detail) - Loans Held for Investment
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Loans Held-for-Investment, Net    
Number of loans held for investment | loan 11 5
Unpaid principal balance of loans held for investment $ 131.0 $ 67.0
Net unamortized deferred fees and costs 0.5 0.4
Allowance for loan losses 0.1 0.1
Loans held for investment, delinquent 0.0 0.0
Loans held for investment, impaired 0.0 0.0
Loans, non-accrual status $ 0.0 $ 0.0
Maximum    
Loans Held-for-Investment, Net    
Loan term (in years) 3 years