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Long-term debts, net - Schedule of Long-term Debts, Including Promissory Notes Payable to Certain Shareholders, Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Principal amount $ 65,000 $ 52,750
Less: unamortized debt issuance costs (3,737) (4,348)
Add: PIK interest accrued to the principal balance 1,700 1,611
Long-term debt, net 62,963 50,013
Less: Current portion of long-term debt (2,750) (4,135)
Long-term debt, net (non-current) 60,213 45,878
12% Term Loan, Due 2020 [Member]    
Debt Instrument [Line Items]    
Principal amount 40,688 42,750
Less: unamortized debt issuance costs (2,753) (3,964)
Add: PIK interest accrued to the principal balance 542 479
Long-term debt, net 38,477 39,265
Less: Current portion of long-term debt (2,062) (4,135)
Long-term debt, net (non-current) 36,415 35,130
12% Incremental Term Loan, Due 2020 [Member]    
Debt Instrument [Line Items]    
Principal amount 14,312  
Less: unamortized debt issuance costs (672)  
Add: PIK interest accrued to the principal balance 9  
Long-term debt, net 13,649  
Less: Current portion of long-term debt (688)  
Long-term debt, net (non-current) 12,961  
10% Promissory Notes, Due 2021 [Member]    
Debt Instrument [Line Items]    
Principal amount 10,000 10,000
Less: unamortized debt issuance costs (312) (384)
Add: PIK interest accrued to the principal balance 1,149 1,132
Long-term debt, net 10,837 10,748
Long-term debt, net (non-current) $ 10,837 $ 10,748