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Long-term debts, net - Summary of Long-term Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Less: Current portion of long-term debt $ (4,824) $ (3,500)
Refinanced Term Loan, Due 2023    
Debt Instrument [Line Items]    
Principal amount 59,445 60,320
Less: Unamortized debt issuance costs (4,529) (4,848)
Long-term debt, net 54,916 55,472
Less: Current portion of long-term debt (4,824) (3,500)
Long-term debt, net (non-current) $ 50,092 $ 51,972