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Note Receivables - Summary of Outstanding Note Receivable Balance (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total note receivable, net $ 28,722 $ 18,748
Notes Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Note receivable (face value) 30,000 22,000
Less: OID, unamortized (2,582) (3,252)
Plus: PIK interest 1,304  
Total note receivable, net $ 28,722 18,748
Commitment remaining   $ 8,000