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Schedule of Related Party Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]    
Principal amount $ 140,200  
Net carrying amount 72,247 $ 79,666
Related Party Debt    
Related Party Transaction [Line Items]    
Principal amount 71,506 79,666
Unamortized premium 815  
Unaccreted debt issuance costs (74)  
Net carrying amount $ 72,247 $ 79,666