Long-term debts, net - Summary of Long-term Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Principal amount	$ 57,225
Less: Current portion of long-term debt	(5,380)	$ (3,500)
Refinanced Term Loan, Due 2023
Debt Instrument [Line Items]
Principal amount	57,225	60,320
Less: Unamortized debt issuance costs	(4,200)	(4,848)
Long-term debt, net	53,025	55,472
Less: Current portion of long-term debt	(5,380)	(3,500)
Long-term debt, net (non-current)	$ 47,645	$ 51,972

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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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