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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, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Principal amount $ 67,062 $ 52,750
Less: unamortized debt issuance costs 4,978 4,348
Add: PIK interest accrued to the principal balance 903 1,611
Long-term debt, net 62,987 50,013
Less: Current portion of long-term debt 2,750 4,135
Long-term debt, net (non-current) 60,237 45,878
12% Term Loan, Due 2020 [Member]    
Debt Instrument [Line Items]    
Principal amount 42,234 42,750
Less: unamortized debt issuance costs 3,694 3,964
Add: PIK interest accrued to the principal balance 553 479
Long-term debt, net 39,093 39,265
Less: Current portion of long-term debt 2,062 4,135
Long-term debt, net (non-current) 37,031 35,130
12% Incremental Term Loan, Due 2020 [Member]    
Debt Instrument [Line Items]    
Principal amount 14,828  
Less: unamortized debt issuance costs 918  
Add: PIK interest accrued to the principal balance 13  
Long-term debt, net 13,923  
Less: Current portion of long-term debt 688  
Long-term debt, net (non-current) 13,235  
10% Promissory Notes, Due 2021 [Member]    
Debt Instrument [Line Items]    
Principal amount 10,000 10,000
Less: unamortized debt issuance costs 366 384
Add: PIK interest accrued to the principal balance 337 1,132
Long-term debt, net 9,971 10,748
Long-term debt, net (non-current) $ 9,971 $ 10,748