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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, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Principal amount		$ 65,000
Less: unamortized debt issuance costs		(3,737)
Paid In Kind Interest Accrued To 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
Refinanced Term Loan Due 2023
Debt Instrument [Line Items]
Principal amount	60,320
Less: unamortized debt issuance costs	(4,848)
Long-term debt, net	55,472
Less: current portion of long-term debt	(3,500)
Long-term debt, net (non-current)	$ 51,972
12% Term Loan, Due 2020
Debt Instrument [Line Items]
Principal amount		40,688
Less: unamortized debt issuance costs		(2,753)
Paid In Kind Interest Accrued To 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
Debt Instrument [Line Items]
Principal amount		14,312
Less: unamortized debt issuance costs		(672)
Paid In Kind Interest Accrued To 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
Debt Instrument [Line Items]
Principal amount		10,000
Less: unamortized debt issuance costs		(312)
Paid In Kind Interest Accrued To Principal Balance		1,149
Long-term debt, net		10,837
Less: current portion of long-term debt		0
Long-term debt, net (non-current)		$ 10,837

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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