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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans Held-for-Investment, Net (Detail)
3 Months Ended 12 Months Ended
Jan. 01, 2020
Mar. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
loan
Loans Held-for-Investment, Net      
Provision for loan losses   $ 1,100,000  
Loans charge off rate in forecasted period 0.09% 0.36%  
Loans charge off rate in remaining period 0.09% 0.09%  
Amortized cost of loans held for investment, current   $ 443,200,000 $ 531,900,000
Loans originated in 2018   170,800,000  
Loans originated in 2019   272,400,000  
Loans Held for Investment      
Transfers of financial assets accounted for as secured borrowings      
Loan portfolio transferred to third party   78,500,000  
Other Liabilities      
Transfers of financial assets accounted for as secured borrowings      
Loan portfolio transferred to third party   70,500,000  
Secured borrowing   $ 70,500,000  
Loans Held for Investment      
Loans Held-for-Investment, Net      
Number of loans held for investment | loan   20 22
Unpaid principal balance of loans held for investment   $ 457,900,000 $ 546,600,000
Net unamortized deferred fees and costs   1,500,000 2,000,000.0
Allowance for loan losses   $ 2,200,000 $ 1,100,000
Number of delinquent loans   1 1
Loans held for investment, delinquent   $ 14,700,000 $ 14,700,000
Number of impaired loans | loan   1 1
Loans held for investment, impaired   $ 14,700,000 $ 14,700,000
Loan originated in 2017   $ 14,700,000  
Number of loans on nonaccrual status | loan   1 1
Loans, non-accrual status   $ 14,700,000 $ 14,700,000
Specific reserve for loan   $ 600,000 $ 600,000
Loans Held for Investment | Maximum      
Loans Held-for-Investment, Net      
Loan term (in years)   3 years