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Long-term debts, net - Scheduled Future Maturities of Total Debts (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
2018 $ 2,750  
2019 2,750  
2020 49,500  
2021 10,000  
Total maturities 65,000 $ 52,750
Add: Accrued PIK interest, added to the principal 1,700 1,611
Less: unamortized debt issuance costs (3,737) (4,348)
Long-term debt, net $ 62,963 $ 50,013