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Note Receivables - Summary of Outstanding Note Receivable Balance (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Notes Receivable    
Total notes receivable, net $ 31,485 $ 28,722
Notes Receivable [Member]    
Notes Receivable    
Note receivable (face value) 30,000 30,000
Less: Original issue discount ("OID"), unamortized (2,167) (2,582)
Plus: PIK interest 2,102 1,304
Total notes receivable, net $ 29,935 $ 28,722