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Notes Receivables - Summary of Outstanding Note Receivable Balance (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Notes Receivable    
Total notes receivable, net $ 28,172 $ 28,722
Notes Receivable [Member]    
Notes Receivable    
Note receivable (face value) 30,000 30,000
Less: Original issue discount ("OID"), unamortized (1,744) (2,582)
Plus: PIK interest 2,928 1,304
Subtotal 31,184 28,722
Impairment (5,138)  
Total notes receivable, net $ 26,046 $ 28,722