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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
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Principal amount $ 70,000 $ 65,000
Less: unamortized debt issuance costs   (3,737)
Add: PIK interest accrued to the principal balance   1,700
Long-term debt, net   62,963
Less: Current portion of long-term debt $ (3,500) (2,750)
Long-term debt, net (non-current)   60,213
12% Term Loan, Due 2020 [Member]    
Debt Instrument [Line Items]    
Principal amount   40,688
Less: unamortized debt issuance costs   (2,753)
Add: PIK interest accrued to the principal balance   542
Long-term debt, net   38,477
Less: Current portion of long-term debt   (2,062)
Long-term debt, net (non-current)   36,415
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
Less: unamortized debt issuance costs   (312)
Add: PIK interest accrued to the principal balance   1,149
Long-term debt, net   10,837
Long-term debt, net (non-current)   $ 10,837