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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans Held-for-Investment, Net (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Loans Held-for-Investment, Net    
Number of loans held for investment | loan 5 12
Unpaid principal balance of loans held for investment $ 67,000 $ 222,300
Net unamortized deferred fees and costs 400 1,500
Allowance for loan losses 100 400
Loans Held for Investment    
Loans Held-for-Investment, Net    
Loans held for investment, delinquent 0 0
Loans held for investment, impaired 0 0
Loans, non-accrual status $ 0 $ 0
Loans Held for Investment | Maximum    
Loans Held-for-Investment, Net    
Term of loans 3 years