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Note Receivables - Summary of Outstanding Note Receivable Balance (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total note receivable, net $ 24,588 $ 18,748
Notes Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Note receivable (face value) 27,000 22,000
Less: Original issue discount ("OID"), unamortized (2,970) (3,252)
Plus: PIK interest 558  
Total note receivable, net 24,588 18,748
Commitment remaining $ 3,000 $ 8,000