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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, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Principal amount $ 52,750 $ 55,000
Less: unamortized debt issuance costs 4,348 4,178
Add: PIK interest accrued to the principal balance 1,611 96
Long-term debt, net 50,013 50,918
Less: Current portion of long-term debt 4,135 2,250
Long-term debt, net (non-current) 45,878 48,668
12% Term Loan, Due 2020 [Member]    
Debt Instrument [Line Items]    
Principal amount 42,750 45,000
Less: unamortized debt issuance costs 3,964 3,729
Add: PIK interest accrued to the principal balance 479 29
Long-term debt, net 39,265 41,300
Less: Current portion of long-term debt 4,135 2,250
Long-term debt, net (non-current) 35,130 39,050
10% Promissory Notes, Due 2021 [Member]    
Debt Instrument [Line Items]    
Principal amount 10,000 10,000
Less: unamortized debt issuance costs 384 449
Add: PIK interest accrued to the principal balance 1,132 67
Long-term debt, net 10,748 9,618
Long-term debt, net (non-current) $ 10,748 $ 9,618