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Schedule of Related Party Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]    
Principal amount $ 99,200  
Net carrying amount 71,981 $ 72,089
Related Party Debt    
Related Party Transaction [Line Items]    
Principal amount 71,506 71,506
Unamortized premium 520 639
Unaccreted debt issuance costs (45) (56)
Net carrying amount $ 71,981 $ 72,089