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Note Receivables - Summary of Outstanding Note Receivable Balance (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total note receivable, net $ 29,317 $ 28,722
Notes Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Note receivable (face value) 30,000 30,000
Less: Original issue discount ("OID"), unamortized (2,378) (2,582)
Plus: PIK interest 1,695 1,304
Total note receivable, net $ 29,317 $ 28,722