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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
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Principal amount $ 66,375 $ 52,750
Less: unamortized debt issuance costs 4,624 4,348
Add: PIK interest accrued to the principal balance 1,162 1,611
Long-term debt, net 62,913 50,013
Less: Current portion of long-term debt 2,750 4,135
Long-term debt, net (non-current) 60,163 45,878
12% Term Loan, Due 2020 [Member]    
Debt Instrument [Line Items]    
Principal amount 41,719 42,750
Less: unamortized debt issuance costs 3,425 3,964
Add: PIK interest accrued to the principal balance 549 479
Long-term debt, net 38,843 39,265
Less: Current portion of long-term debt 2,062 4,135
Long-term debt, net (non-current) 36,781 35,130
12% Incremental Term Loan, Due 2020 [Member]    
Debt Instrument [Line Items]    
Principal amount 14,656  
Less: unamortized debt issuance costs 850  
Add: PIK interest accrued to the principal balance 11  
Long-term debt, net 13,817  
Less: Current portion of long-term debt 688  
Long-term debt, net (non-current) 13,129  
10% Promissory Notes, Due 2021 [Member]    
Debt Instrument [Line Items]    
Principal amount 10,000 10,000
Less: unamortized debt issuance costs 349 384
Add: PIK interest accrued to the principal balance 602 1,132
Long-term debt, net 10,253 10,748
Long-term debt, net (non-current) $ 10,253 $ 10,748