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Long-term debts, net - Summary of Long-term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Less: Unamortized debt issuance costs   $ (3,737)
Long-term debt, net   62,963
Less: Current portion of long-term debt $ (7,227) (2,750)
Long-term debt, net (non-current)   $ 60,213
Refinanced Term Loan, Due 2023    
Debt Instrument [Line Items]    
Principal amount 64,921  
Less: Unamortized debt issuance costs (5,231)  
Long-term debt, net 59,690  
Less: Current portion of long-term debt (7,227)  
Long-term debt, net (non-current) $ 52,463